Malicious PDF — malware analysis report

Static analysis result for SHA-256 647755e9dd35406c…

MALICIOUS

PDF

82.8 KB Created: 2021-09-02 21:11:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 5071e9608c98e683c456cf8271ab64d9 SHA-1: bd999db91fc1e6b53c920ea825edcc029e38ed1a SHA-256: 647755e9dd35406cb649c8d5df3b0df6b36b9ca1a78c64fe91319915092c036c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting, likely to distribute further malicious content or phish users. The PDF structure itself does not contain executable scripts, but the embedded URLs are the primary attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 https://irlanc.ru/uplcv?utm_term=libros+sobre+guion+cinematografico+pdf PDF link annotation
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/3d44c24aaa0d4e2ba001ae3bed1cc880/ribiz.pdfIn PDF document text
    • https://abeess.com/userfiles/file/53716420487.pdfIn PDF document text
    • http://astro2sphere.com/admin/images/file/binisetufumajuramuv.pdfIn PDF document text
    • http://odpadykj.cz/UserFiles/File/94448498133.pdfIn PDF document text
    • http://mspchicagolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nafunifufilar.pdfIn PDF document text
    • http://nfc-lampang.com/user_img/files/tukujiwiromorok.pdfIn PDF document text
    • http://professional-tuner.at/uploaded/file/36887202032.pdfIn PDF document text
    • http://windowsplusllc.com/ckfinder/userfiles/files/vunesabadaxilepitirif.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/16084a3858e94c---20343931647.pdfIn PDF document text
    • https://tsegypt.com/file/32481330885.pdfIn PDF document text
    • https://seeyounow.net/userfiles/file/39771224135.pdfIn PDF document text
    • https://jatransfer.com/userfiles/file/siripi.pdfIn PDF document text
    • https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/411c1ffd104b06f6855e92533e508ca7/93403466070.pdfIn PDF document text
    • http://www.cbs-emballages.com/upload/file/83882578635.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/62314840798.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/vavexinilewox.pdfIn PDF document text
    • http://ayurveda-shiatsu-nice.com/upload/files/tajefuxupigi.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/sl5dtqit92mjn75v5d75mo01ut/76230208503.pdfIn PDF document text
    • https://muguet.fr/sites/default/files/file/67799984096.pdfIn PDF document text
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/2b57d452896969b9d654357c93401508/53091348685.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/e749309ab2386134e8602c0db41a3e15/wanunezisagev.pdfIn PDF document text
    • http://jcnjl.com/userfiles/files/11277941054.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607094d669657---19861582700.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d901.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD901 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f118.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF118 11112 bytes
SHA-256: f9cdc5a91e7feb03b959b41e671115201162ef68b7ac4b16b9c7e14b2b965e2b
font_02_sfnt_off00010aa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AA0 19072 bytes
SHA-256: 99afcd1ea27ec8283fac4ff31e6b847b89b8c86cb18344a1ccb5e4f5bd0b8982

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