Malicious PDF — malware analysis report

Static analysis result for SHA-256 e32c3fc6919602b4…

MALICIOUS

PDF

86.1 KB Created: 2021-09-06 16:28:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0a90b87f81983d31d6853caef4ab7899 SHA-1: 0352f24c493d41e40bfe663311e63480f01e1a7a SHA-256: e32c3fc6919602b4ca91622bb30ef4608029cc78a87e3018d0cfb973df0bf92d
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites. This behavior is indicative of a link farm, likely used for SEO manipulation or to host phishing pages. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/pas2bpn35uik8llfqsbc8uceii/2785255848.pdf In PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16087d3dacf794---baxet.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/dcc8f9c9a4695bf4b4fa4eb68d381d32/4789937673.pdfIn PDF document text
    • http://skupka23.ru/upload/m/wikum.pdfIn PDF document text
    • http://guowangcable.com/d/files/48515103585.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607683b68d9cd---19904138372.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/d7419a17e82082b9520ce50bf5fe3630/80354371974.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/2807369106.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/a8183dca5e9613ce5a08e871f4b279f0/99461789223.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e85555ae155---74959432692.pdfIn PDF document text
    • http://yepuco.com/uploads/files/rijowotemisoruni.pdfIn PDF document text
    • http://elijasprojekts.lv/files/file/93884410670.pdfIn PDF document text
    • https://vnnc.vn/img-hdmedia/files/kakitawobuvo.pdfIn PDF document text
    • http://mesterek.net/tmp/dotabogipufapa.pdfIn PDF document text
    • http://cnzgks.com/userfiles/file///jabebobu.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609565d687073---wimegewarodetakokerip.pdfIn PDF document text
    • https://alternatifhirdavat.com/upload/ckfinder/files/padulilareder.pdfIn PDF document text
    • https://brod-plovdiv.com/images/murab.pdfIn PDF document text
    • http://www.lnk-creation.fr/upload/file/80040695153.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097296d68650---pemoxunipuxavikokaxuwux.pdfIn PDF document text
    • http://pi-consulting.ch/download/putosoranefufadapo.pdfIn PDF document text
    • https://istanajp2.com/contents//files/vototezaloxawivabasibo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=frigidaire+dehumidifier+50+pint+fdl50s1+manualPDF 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_off0000e516.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE516 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fd2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD2D 11208 bytes
SHA-256: 0fa6ad6ffc9496c817245325f202d0ee8e8fa8e50871239b7dcc0531ca86d722
font_02_sfnt_off00011707.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11707 18856 bytes
SHA-256: be5d0a068b3653e4b82a41d595805af076da1b8e5d6931e70f7d35118548eb5c