Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bbc92a303e26657…

MALICIOUS

PDF

88.0 KB Created: 2021-06-27 09:10:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 77147b5a1be3c31eb84d753d17548530 SHA-1: 82049387d4d13d5c875e74933b9283e69107c266 SHA-256: 8bbc92a303e266578ad8efef60fc02037ba62d45c5c53364acd26af8ad430c4c
156 Risk Score

Malware Insights

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

The ML classifier and ClamAV detection strongly indicate maliciousness. The PDF contains a link farm pointing to numerous distinct hosts, many of which appear to be compromised or disposable, suggesting an attempt to distribute malicious content or conduct phishing. The document body is heavily obfuscated and unreadable, providing no direct clues to its intent beyond what the heuristics reveal.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://windowsplusllc.com/ckfinder/userfiles/files/sevonawarofelodazu.pdf In PDF document text
    • http://agataklimowska.pl/userfiles/file/59757695358.pdfIn PDF document text
    • http://syuncyoku.jp/upload/file/71464114629.pdfIn PDF document text
    • http://sakem.org/userfiles/files/riwopanakigizoleke.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/333npru27lp8j4rda44tla8iq3/fafanipezemawekoxulugefez.pdfIn PDF document text
    • http://scro.ru/pic/file/tibamomiwizarafupa.pdfIn PDF document text
    • http://montgomery71.com/clients/34132/File/76421015819.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1609aa68c6122e---87130151750.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606eff4e78f10---97839444733.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160806a3ba6d86---makusegefovuj.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ecee0310a8---85689236393.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bffa1b673e5---suluwexivalorozolugab.pdfIn PDF document text
    • http://theartofdesign.nl/ckfinder/userfiles/files/fubifijepikewovonuzigap.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/ed6de69b812a2a4b1602ce57c65708f6/pakejoj.pdfIn PDF document text
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/33116529971.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3da981566---dafotiruvonulijusukunakup.pdfIn PDF document text
    • http://alteredcompta.com/buddha/ckfinder/userfiles/files/lokuxul.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/1si6h2tq74obn87mgl4mn3umf3/16973993489.pdfIn PDF document text
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160a98e8204cd9---20828348731.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16081c22fa3b38---wewafijorujedusixonunavim.pdfIn PDF document text
    • http://keluargamimpi2.com/contents//files/25800705094.pdfIn PDF document text
    • http://mp-journal.com/media/file/22131569961.pdfIn PDF document text
    • http://perles-del-beya.com/userfiles/file/kubowivanafaxapujukivuv.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/02a40ae23e29a028fbd52a4b8c9d3afe/waxabigegebowoxan.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/mviagle98bn47slqetpplfu66h/faxolofisurapelo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=over+the+scarredPDF 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_off0000f012.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF012 19180 bytes
SHA-256: 743754f5d476b6f421ceb7a58a7677455939ad3383ac545e8bd8e56ab039de9d
font_01_sfnt_off00012223.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12223 10196 bytes
SHA-256: f3b11e2b9fe2ed3f5558608e443f6f18e1783b5dffe134a351ac0f2aa27159e5
font_02_sfnt_off00013948.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13948 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1