Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f9e2ec84f05bc8f…

MALICIOUS

PDF

120.0 KB Created: 2021-09-04 18:00:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 84da40d984d4ae6bda6737d1c8d6143d SHA-1: d7380655a800b06002370fd9c6e52d7ecef5455c SHA-256: 0f9e2ec84f05bc8f3b3ddc501b7204714f54710100c853b3d39962ad070f6b3c
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, indicating a link farm designed to redirect users to malicious content. The 'SE_CALLBACK_LURE' heuristic suggests a phishing or tech-support scam pretext. While no scripts were explicitly extracted, the ML classifier and ClamAV detection strongly indicate malicious intent, likely involving the exploitation of PDF vulnerabilities or the delivery of a second-stage payload via the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://krossinkeuka.org/clients/c/c6/c64aa726effa6776341672ea469011e7/File/luzutopokuxubodi.pdf In PDF document text
    • http://bettaletroom.com/file_media/file_image/file/42668908870.pdfIn PDF document text
    • https://bruceautoservice.com/files/file/22055691888.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/128a900343aa28c1fc3609ac61e0219a/petukitenabujekavifiseg.pdfIn PDF document text
    • http://taispacedesign.com/upload/files/sulovulefuluwawivu.pdfIn PDF document text
    • http://fundacionecla.org/resources/original/file/retikuparukevid.pdfIn PDF document text
    • http://hylimusic.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/labofisufobo.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ab6c6e6c05e---nekesuvibofosatuleg.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/160adbc8a93651---4308671171.pdfIn PDF document text
    • http://www.prieteniitehnicii.ro/documente/file/bojiwilutatavajobap.pdfIn PDF document text
    • http://deficanderel.com/clients/6/67/674a09facce11b7629d390eef9534ff9/File/89081765709.pdfIn PDF document text
    • http://smolensk-bakaleya.ru/userfiles/file/75615880585.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/75659206335c1bd5c2013365c4533a6b/vepigetadinoposolu.pdfIn PDF document text
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a074075053---vamiso.pdfIn PDF document text
    • http://tourbusan.net/FileData/ckfinder/files/20210604_9901DFD740EEF868.pdfIn PDF document text
    • http://morgancountyoh.com/userimages/53449455722.pdfIn PDF document text
    • http://casinodanmarkjackpot.dk/userfiles/file/muxas.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1610313d7b3886---gilifuma.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1611410b12d67b---bisukagunenonavapune.pdfIn PDF document text
    • http://inbeeldt.nl/userfiles/file/jukoxapuziv.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/mukazunazajivu.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608b535324a42---miliguzetomov.pdfIn PDF document text
    • http://englishkan.net/UserFiles/File/87699583019.pdfIn PDF document text
    • http://www.integra-cr.cz/administrace/ckfinder/userfiles/files/86607024484.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=lavasecadora+samsung+10+kg+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_off000168c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x168C1 10912 bytes
SHA-256: a1bcba600b4235f732379a8cd149dda6f11165e10de79715c05b0c266e3c0b18
font_01_sfnt_off000181db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x181DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000199ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x199ED 21368 bytes
SHA-256: 649d695c77677caa63b47d50c41918ef416f464de2cf9ff3e7df1447f0d8d661

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