Malicious PDF — malware analysis report

Static analysis result for SHA-256 a543cbd604db5dca…

MALICIOUS

PDF

84.8 KB Created: 2021-09-09 14:11:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 1292a6e113767e2a7674b9aeaa1d02d7 SHA-1: 06b37a7a4c77576cc9496004bbe8878cdde1f5f3 SHA-256: a543cbd604db5dca9ce217f8b8e211e8ff5c2ccc76e8c8ec794238080cb55f1b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://turismopontevedra.com/ckfinder/userfiles/files/dugupunupivoximewetov.pdf In PDF document text
    • http://falerisztika.hu/tmp/sidojagemasijijupa.pdfIn PDF document text
    • https://suacuacuontoanphat.com/upload/files/89398980695.pdfIn PDF document text
    • http://georgekoldun.com/var/upload/file/77305603682.pdfIn PDF document text
    • https://mhreng.com/userfiles/file/gemuzewunezivazinuwatine.pdfIn PDF document text
    • https://badoza.net/userfiles/file/97825870661.pdfIn PDF document text
    • http://handsonmontessoripk.com/userfiles/files/75066345101.pdfIn PDF document text
    • https://www.kuwaitpolyurethane.com/ckfinder/userfiles/files/gukonekulosibas.pdfIn PDF document text
    • http://csc0516.com/userfiles/file/20210905170838_7f3fw9.pdfIn PDF document text
    • http://uco-kampen.com/media/files/85225330187.pdfIn PDF document text
    • http://ugyvednok.hu/userfiles/file/zatezajazabaruxid.pdfIn PDF document text
    • http://interface-referencement.com/userfiles/file/damixelofagikopofonex.pdfIn PDF document text
    • http://sp3siemianowice.pl/userFiles/files/45541418530.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613127f387a42---19891379061.pdfIn PDF document text
    • http://jeykrishnaclub.com/images/file/24632738972.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021090800184818.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/00c91fb2c258ffe061e609914a47b504/guzogi.pdfIn PDF document text
    • https://jpt.mysmartedu.com/uploadimages/files/33845874456.pdfIn PDF document text
    • https://thietbigas.net/media/files/zuwagofulisos.pdfIn PDF document text
    • https://groupunsur3.com/contents/files/jojosurelidesegu.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161358f5883f5a---kovifujekepaditobewogiw.pdfIn PDF document text
    • http://mackyz7automotive.com/js/upload/files/55046622347.pdfIn PDF document text
    • http://castrolmintabolt.hu/images/upload/file/sipibuzixojorewukasuzozuw.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161332784bcc8a---diwasidusibivegawabax.pdfIn PDF document text
    • https://akgoz.zemta.com/uploads/files/kubawiz.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed06de5ea4---jurunuwosetuve.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=angry+birds+star+wars+hack+downloadPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e677.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE677 17328 bytes
SHA-256: 6fe92ac23fb2ccbd6ef18e48b338b98c2788e033e8a5449ab4719272fa78a58c
font_01_sfnt_off000113a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113A4 10928 bytes
SHA-256: 78a50ccbea2829ca8ca80e91205ee4652b920fa030b9984f7ae175a1f1898fd8
font_02_sfnt_off00012cce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CCE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1