Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2eff9c4fe7061f6…

MALICIOUS

PDF

92.1 KB Created: 2021-07-17 08:21:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 3f26e1531189be4bfa79f0f9658ad3b4 SHA-1: 7254ca78a4cc200e41b37e3ab36d1555ba1a0fc9 SHA-256: e2eff9c4fe7061f64077f5b562c6acc1017e615e40d98b6f51a40afa065ed612
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a phishing or malware distribution attempt. The presence of embedded URLs and the nature of the heuristics indicate that the document is designed to redirect users to malicious content, likely exploiting the 'Spearphishing Attachment' technique.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9746

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://www.dartmusicfestival.co.uk/wp-content/plugins/super-forms/uploads/php/files/c88a38b3da57e82f837e3625884f5045/jefaxa.pdf In PDF document text
    • http://cnex.cc/images/blog//file/41118623018.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c55811501d2---tibufoxalefijiru.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/dtrqqbjm7nq39sdumf8kqqqt06/wigijuwanarurasefuzujigud.pdfIn PDF document text
    • http://www.contectrade.hu/fckfiles/file/39611655922.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1606f689b2e4ba---87025123287.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/160de88f405295---xowekozuzofun.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1608fe3f10cc49---46626811365.pdfIn PDF document text
    • http://sjhrz.com/images/upload/File/37569240866.pdfIn PDF document text
    • https://aravlicraft.com/cmsCart//upload/file/78270895257.pdfIn PDF document text
    • http://hrjok.com/uploadfile/file/sugiwodadadilifulo.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160709453722a8---68718284662.pdfIn PDF document text
    • http://rolmech-strzelno.pl/Upload/file/damawovovevipurinef.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d877a06247---binukumutoxesulemetux.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/1607d060ab90b2---96597402611.pdfIn PDF document text
    • http://www.emailposte.com/pictures/9024478175.pdfIn PDF document text
    • http://fotostudiovaccari.it/userfiles/files/raxuxoramewobimumiwipujo.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c0d7c43846c---zoputemobotozuve.pdfIn PDF document text
    • https://ewt.cz/res/file/99548853792.pdfIn PDF document text
    • http://uniroll.pl/user_images/file/segabisimoxolixeku.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/2phb2rr47i07td3r4gcsjibm83/tamapulofevafura.pdfIn PDF document text
    • https://asiquim.com/ckfinder/userfiles/files/17836055313.pdfIn PDF document text
    • https://equantumconsulting.com/files/files/najidikumivup.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160beeff0b6f1c---muronororobakarime.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/16079495b46b2a---80291789611.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd97d53cd46---zujifolizevananof.pdfIn PDF document text
    • https://monocroma.it/wp-content/plugins/super-forms/uploads/php/files/0bc48631a872c993d3f4f3870b0c0bbf/sororuwokotezejo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=what+is+the+meaning+of+jahPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA99 10636 bytes
SHA-256: db3e2b2be459c702fb9df8a351310aae53132ab64aeccc30786e958d35b32dde
font_01_sfnt_off000102c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102C5 19480 bytes
SHA-256: 8165a15e6c3a8177b886b7b4871b55dcc1bef450167d050d444db31d415670ad
font_02_sfnt_off00013470.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13470 16208 bytes
SHA-256: 63704519a1b2e29de2f598c4814d51a7e74aacfa53322ca10327fe269d346aac
font_03_sfnt_off00014a43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A43 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1