Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4732b3929adc0aa…

MALICIOUS

PDF

80.5 KB Created: 2021-09-04 04:46:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1ded3067f4fa743481e8b7f5cac71085 SHA-1: dcc43ffe82cbad8a641ce0b793e38a00215d2a93 SHA-256: b4732b3929adc0aab0681710a92556f63088d125ecd03e5f1612671333faf9ba
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many of which point to compromised WordPress sites and other disposable hosting, suggesting a phishing or spam campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to malicious content or further stages of an attack. No scripts were extracted, but the PDF structure itself is indicative of a link farm designed for malicious redirection.

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 http://lucann.com/Upload/file/32331703602.pdf In PDF document text
    • http://lapawan15.com/shop/fck_file/file/mitawagimijedu.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/f02c7878ced551cb28e01e7adc0139fb/2051702403.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce4af8ee2b---7479517282.pdfIn PDF document text
    • https://parokisantolukas.org/Uploads/userfiles/files/giroganotilaronatijo.pdfIn PDF document text
    • http://bbbo.handyfriendship.com/upload/files/voropumit.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/3834052725.pdfIn PDF document text
    • http://rainesclassof1980.com/clients/3/31/314d3ac3c31ee16cfc8f78d457af0ebc/File/42883932159.pdfIn PDF document text
    • http://villapellegrino.it/userfiles/files/jojeroxowijigowotul.pdfIn PDF document text
    • http://grandchainfamilyfoundation.com/clients/85333/File/butakosujososo.pdfIn PDF document text
    • http://arniestribu.com/campannas/file/kipalom.pdfIn PDF document text
    • https://www.lightingsolutionsal.com/wp-content/plugins/super-forms/uploads/php/files/2085ac60d37f69b2a8af30eb35863acb/bijogusitomamatomurijose.pdfIn PDF document text
    • https://avayemehr-carpet.ir/data/file/sumuwezagasajowiz.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16070bd9f0edc5---zolaresuzule.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/45a823c88843408cb0fb90020f6ff255/povivugujobokenamasino.pdfIn PDF document text
    • https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/c56bf59aa9fa10532f343016fb49b442/80575393837.pdfIn PDF document text
    • http://sumosushingrill.com/uploads/files/zevumedol.pdfIn PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/nqrbvnanktql4650l8l4ml4nj6/tijukote.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610f94b73a061---sorofanajurilajeludova.pdfIn PDF document text
    • http://sqc.jp/user_data/editor/ckfinder/core/connector/php/upload/files/51565813636.pdfIn PDF document text
    • http://bezpiecznamlodosc.org/files/file/piluseluzixofi.pdfIn PDF document text
    • http://zjhywt.com/images/upload/File/jakebojaxuzitewo.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/4f7a14a7a6bffc904e63cc971c8faa4b/nepexitusowuwexabowadal.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=materia+escura+blake+crouch+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_off0000d139.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD139 19112 bytes
SHA-256: c06b3c8ba70e1fc033e4dbf72278ba647d89bb15097163fb218aa882f5fde66f
font_01_sfnt_off000102cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102CB 10936 bytes
SHA-256: 93ee2c7ee6252c79477d197e66256240941b81f489095a8c751a35bee81be28e
font_02_sfnt_off00011c12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C12 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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