Malicious PDF — malware analysis report

Static analysis result for SHA-256 329a8fc96fc220b0…

MALICIOUS

PDF

79.6 KB Created: 2021-09-08 06:58:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 341758a85d2fd27bbc65573384815499 SHA-1: 38150b0c9bbff347bd3667ec8e06100b2d2957b0 SHA-256: 329a8fc96fc220b0c95602319c5e1432b2e7e31e0118cf85ca0f251a101ef7e9
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or are part of a link farm designed to obscure the final destination. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution through these links. The file's structure and URL patterns suggest it's intended to lure users to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://elitk.ru/_files/15528168173.pdf In PDF document text
    • http://ranaghatpchsschool.org/userfiles/file/dezemimivanatax.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/f4f64f55c4eab19993bfcd3b040190b1/18758792923.pdfIn PDF document text
    • http://logo4you.dk/userfiles/file/jewalefivelezid.pdfIn PDF document text
    • http://almar-bus.pl/userfiles/file/sesukixaliredefidozu.pdfIn PDF document text
    • https://xn--fiqa735be48e.com/upload/files/79552456211.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607924cb6821b---86876542917.pdfIn PDF document text
    • https://doanhnghiepvietnam.org/img_duhoc/files/71666394441.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/d9574f0195dfae7d63e276eb924f373b/keliz.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/4pmds2inus5kbo8bal40a097k2/28102785802.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc847ddf7ba---tufolokujikiwuxixesav.pdfIn PDF document text
    • https://trellisdundee.com/wp-content/plugins/super-forms/uploads/php/files/641a545ac12913d5f337c23bba8e967c/57497585359.pdfIn PDF document text
    • http://teacherandtraining.com/coj_u/KK/userfiles/files/zifewovinaxan.pdfIn PDF document text
    • http://www.kingsmen-cmti.com/upload/files/11148925807.pdfIn PDF document text
    • https://pointsourcegroup.com/wp-content/plugins/super-forms/uploads/php/files/2e0550915966e1b199717a70ff2218cc/sesedofironafezaledagude.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/1609bbcd9d2e4b---datidubodepegonujuji.pdfIn PDF document text
    • http://joy05.com/_UploadFile/Images/file/93742613098.pdfIn PDF document text
    • https://basisnomor.com/contents//files/guwekuzumij.pdfIn PDF document text
    • http://aurora-c.jp/files/files/wepejekubini.pdfIn PDF document text
    • https://taevlingar.se/images/pages/file/lunaji.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/160a7220a82563---88604004657.pdfIn PDF document text
    • http://yuhenganquan.com/userfiles/file/20210531144744_825955780.pdfIn PDF document text
    • http://ichieh.tw/uploads/files/202108150850458458.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=nfhs+baseball+rules+pdfPDF 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_off0000d41f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD41F 17584 bytes
SHA-256: 820e1c15baaec22f7a1a0c823fedbf60b895a566a377f6385f022e9cc381cfed
font_01_sfnt_off00010193.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10193 10400 bytes
SHA-256: 749e8ef74d0ad88d2634e91807b65b83ac7a44355880fdd1f0c9f4a8fdcecb08
font_02_sfnt_off00011906.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11906 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1