Malicious PDF — malware analysis report

Static analysis result for SHA-256 339bfb5897965d0c…

MALICIOUS

PDF

79.1 KB Created: 2021-09-04 14:43:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: db4bfa7f2a00f7be5eef6f2d66b3be9f SHA-1: c6a72c37e3689b4acc6fc3f4a5f326f07e40add1 SHA-256: 339bfb5897965d0c810c1151ee1a8aba7d243c294dfadb20ecc77859a1bdca75
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, indicating a link farm for SEO poisoning or phishing. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to distributing further malware or leading users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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.
  • 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 http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/1607ad615cbf32---bunopuzu.pdf In PDF document text
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088354680b31---38207120193.pdfIn PDF document text
    • http://www.yevres.fr/ckfinder/userfiles/files/96771958290.pdfIn PDF document text
    • https://pirkitpadangas.lt/ckfinder/userfiles/files/32726861528.pdfIn PDF document text
    • http://matraholding.hu/images/userfiles/files/34004232191.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608284b691744---solotudoropemezirixebibam.pdfIn PDF document text
    • http://beerskiboot.de/img/upload/file/33262640912.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/16114f4779ba21---xarevasasi.pdfIn PDF document text
    • https://jasmijnbloemengroen.nl/userfiles/file/64733041774.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca8c7aad78---regegewibafexojanow.pdfIn PDF document text
    • http://avs-market.ru/admin/ckfinder/userfiles/files/56789258655.pdfIn PDF document text
    • http://ledson.ru/upload_picture/zeselurafenadobo.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/k76s8fdorlpt5cs24trks7579p/99205603082.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612e7e32c7225---16656319441.pdfIn PDF document text
    • http://bdn10.cz/files/file/89866029449.pdfIn PDF document text
    • http://sotel-perm.ru/site/file/51755160329.pdfIn PDF document text
    • http://animalscipublisher.com/files/upfiles/file/58498310827.pdfIn PDF document text
    • http://altelaw.com/uploads/image/file/32798204287.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/62771318014.pdfIn PDF document text
    • http://huile-de-nigelle.info/userfiles/file/lekubewosulerafefise.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1608608e8ec32c---58368897153.pdfIn PDF document text
    • https://ideylia.fr/uploads/file/jerenowosilameb.pdfIn PDF document text
    • http://abwlargo.com/uploads/files/75909291373.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=hitachi+cordless+framing+nailer+manualPDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/8e64de9fce2cb8eeb4ba2067d125e8ec/xunojerisufazadugiwiv.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_off0000d106.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD106 17092 bytes
SHA-256: 44c418ec37fb57fc277579a37a91ac512dafb12c8c597bc03881e89092aa53d4
font_01_sfnt_off0000fd90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD90 11012 bytes
SHA-256: e35585e78aec9d00e49fa3ec42c2741fa7f533e84e35efce76ac0abd11fd67e2
font_02_sfnt_off000116c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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