Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e4fa045dc1627c1…

MALICIOUS

PDF

72.9 KB Created: 2021-08-28 00:43:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: dffe611ffa42ae32d195852ae003d339 SHA-1: d658ffe0d8d940815c401e2e47008977b09ced78 SHA-256: 5e4fa045dc1627c1b11af23f0aa0bbc2ec571b3e7342741969d1341ea9c6fec0
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the PDF structure itself facilitates the attack by hosting these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://oniceh.ru/uplcv?utm_term=bruntsfield+links+pitch+and+putt PDF link annotation
    • https://j26clean.com/upload/files/suleditenipamepewala.pdfIn PDF document text
    • https://ski-valloire.com/ckfinder/userfiles/files/megitike.pdfIn PDF document text
    • https://ctsgroups.asia/images/file/15496632544.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/bcaddb2f468363d89165c81c51d3d0dd/wolegabat.pdfIn PDF document text
    • http://yotlist.com/uniformkontakt/userfiles/image/files/20624264698.pdfIn PDF document text
    • http://imhkayseri.com/resimler/files/milofutabijasatupawu.pdfIn PDF document text
    • http://bastola.org/userfiles/file/698005518.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/16076872a28de1---28049637803.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/19bc4ba606d3fb1c966da033ef6f327b/18794063456.pdfIn PDF document text
    • http://jarauwerdaenzn.nl/userfiles/file/5935797307.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/e4c8a317ae2d7950d9caa5aa3122f99f/28508199317.pdfIn PDF document text
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/rcvo1di3rdt8hq2o0dreq71ckb/45689616405.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160ade8f6a1fb3---74747450157.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/188aded1fdc905c4ab2e62998cd09c4c/lojowozimev.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b5b27388164---7632707520.pdfIn PDF document text
    • https://brod-plovdiv.com/images/26938928228.pdfIn PDF document text
    • https://khogiaydantuonghanquoc.com/images/news/file/mediwaparimizifisejafuga.pdfIn PDF document text
    • http://ambulatorioveterinarioscapindandrea.it/userfiles/files/sutebepakulesagafozanonod.pdfIn PDF document text
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/2ae9615ed6d9c6d231f1a7887b5ee1c6/raxed.pdfIn PDF document text
    • https://pk-kuepfer.ch/ckfinder/userfiles/files/nunirefitod.pdfIn PDF document text
    • http://clingac.com/d/files/jivutonexisixexikiwi.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a500da34450---73221778578.pdfIn PDF document text
    • http://yas-center.ru/userfiles/file/zewogolidevakipemini.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c8c4533988d---xesufuwikowamilifofub.pdfIn PDF document text
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ba0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA0A 10844 bytes
SHA-256: 45fb4ce879bc1b69dbb121eb883019dfc15cfb56f560b6f0e292b0658e49bda3
font_01_sfnt_off0000d309.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD309 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eb1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB1B 16544 bytes
SHA-256: f49ba53c4b08f06e4f452316f54ad2a3ae271d7f64f4a4d22c200e173ea25859

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