Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2b4a15fa349618d…

MALICIOUS

PDF

91.2 KB Created: 2021-06-29 03:28:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b942907d1150c9dc304d02e2c86bc891 SHA-1: 28c379084249a05dece4cddc2f5f5101573e5362 SHA-256: f2b4a15fa349618d36da67dc09e4c4abfc887cb52fd98baf6e4e89631460b68d
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple compromised WordPress upload directories and disposable hosting sites, suggesting an attempt to distribute malicious content or conduct phishing. The presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicate a focus on directing users to potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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 https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/5aa11abeef24167c7a1d6b9701e0fddd/76628824190.pdf In PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/5ac4c08cf901ef0a076d8d98f29200ee/ladesozonewepeja.pdfIn PDF document text
    • http://kingalbertltd.com/uploadedfiles/file/nikonofitewufajuwegose.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/45887e96f49facbc484d37de7a91dc11/95571013738.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc17c300b7---nonejaperib.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607ea93628bc6---86792650132.pdfIn PDF document text
    • http://kaupa.cz/userfiles/file/fapenavizimarodokeku.pdfIn PDF document text
    • http://atomleasing.ru/media/File/winigosoxazafinifit.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb26d0c3c8---29413554410.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/16097d14cc473f---vonekimugokukize.pdfIn PDF document text
    • https://lightspec.ca/wp-content/plugins/super-forms/uploads/php/files/c6b454b1e4c4132fad2a090e861390a1/47067222304.pdfIn PDF document text
    • http://mega.kz/media/upload/files/20900581519.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/kbf5uso15n9mhnh3ar8v4f1hq6/vitodabom.pdfIn PDF document text
    • http://alltechsro.cz/files/82206197316.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/102d2593c99fa4243bce046ea9232ff7/borubajesadawubuvi.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/160913a946eadc---diwano.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/80341390042.pdfIn PDF document text
    • http://carnavaldemarbella.com/Senegal_5/Content/files/userfiles/file/jaluwuremonimisajoxolubo.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082473a3d6d3---52861041422.pdfIn PDF document text
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/2c14c78a4106e50f27a8e887880e525e/28715734820.pdfIn PDF document text
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/d5qav6284d7q2pd2sir80gtuqa/norapapezujezinezomapus.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/zefisewawoxejamujijexi.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/73b01962b2b7accf53231350a999996d/79543643619.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/e44uc2f4apipu8tqo5ueeff2nv/66665154591.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096386294828---guxigeziluxutilowaxob.pdfIn PDF document text
    • https://cleaner.pl/userfiles/file/belusirorerimi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=erikson%27s+theory+of+psychosocial+development+considersPDF 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_off000101ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101CE 16600 bytes
SHA-256: 34d65190f9fc08bcaa55415536e819338f3d2fdf9cd7bfa0a9ca456d26e59116
font_01_sfnt_off00012d00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D00 11176 bytes
SHA-256: 56a7cf30acec48b7026f130e52f99d0bc1478dfb0769e1b5a57cc10c4491ca19
font_02_sfnt_off00014702.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14702 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1