Malicious PDF — malware analysis report

Static analysis result for SHA-256 b79176a0782290ea…

MALICIOUS

PDF

82.2 KB Created: 2021-09-21 10:45:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d89af7f0c4f4419db66b607e89fdb947 SHA-1: f548f1b73a5b3df5130e916c2d62761282a5c093 SHA-256: b79176a0782290ea873ea531a91861f5c0a8924c279e7657c16fe442f1b42890
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many pointing to compromised WordPress sites or disposable hosting, suggesting a phishing or malware distribution campaign. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the nature of the embedded links and the PDF structure are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://infrive.ru/uplcv?utm_term=aplikasi+hack+game+android+root PDF link annotation
    • http://korvet-sp.ru/userfiles/file/wenadapazepafizobob.pdfIn PDF document text
    • http://se-ty.com/uploads/userfiles/file/godusukal.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/fkn43rhmasr29qtr2vtml984ej/vezinabawexezoxoxobo.pdfIn PDF document text
    • https://naucharts.com/ckfinder/userfiles/files/49822638247.pdfIn PDF document text
    • https://angkaganjil.com/contents/files/50054649353.pdfIn PDF document text
    • http://phamtrangia.com/upload/files/xazapawel.pdfIn PDF document text
    • http://evevoyance.fr/adh/.-/file/gotosoxaga.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/16137f2f1257d6---gozevezevol.pdfIn PDF document text
    • http://wedooverseas.com/userfiles/file/68303576485.pdfIn PDF document text
    • http://kingsfci.com/userfiles/file/24963963798.pdfIn PDF document text
    • http://ntvietnga.com/upload/files/13201309348.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/c8d035692cf83e88c7ea2143b5d04faf/rebemugur.pdfIn PDF document text
    • http://www.sas.edu.mn/ckfinder/userfiles/files/sarabuni.pdfIn PDF document text
    • https://tidurmalam.com/contents/files/79685793452.pdfIn PDF document text
    • http://lamgi.pl/ckfinder/userfiles/files/69132096068.pdfIn PDF document text
    • http://vietcem.vn/public/default/ckeditor/files/vopukufofulo.pdfIn PDF document text
    • https://www.drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613f9e6fd2ebd---dikek.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/467d6d4eb1b1de615c5f3c380479a844/1858904281.pdfIn PDF document text
    • https://immsac.pe/sgi_userfiles/userfiles/files/76337524660.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/16135426bba827---19054152770.pdfIn PDF document text
    • http://ambulatorioveterinariocigliano.com/userfiles/files/kabeduvi.pdfIn PDF document text
    • http://faradtvandor.hu/picture/userfiles/file/domagobosapamipobo.pdfIn PDF document text
    • https://gsm.company/ckfinder/userfiles/files/kenetazegifaso.pdfIn PDF document text
    • http://metabolizmusonline.hu/images/upload/file/vevodi.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_off0000d9cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9CF 11032 bytes
SHA-256: c4dc782bc9585a5e6287f551bf992287a30b66649f48a8dfbb905ea3689474a7
font_01_sfnt_off0000f320.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF320 18328 bytes
SHA-256: ed550bd886cb91a0d90420f43a5619253c4bd44d9b93e23f0249b6890a633df6
font_02_sfnt_off000122a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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