Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb52907637ad768c…

MALICIOUS

PDF

101.2 KB Created: 2021-08-10 04:33:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 26e153df4ec7a20df4a7b56e85058731 SHA-1: aed6394d4965bdcd51ffb166588b00a20a93a965 SHA-256: bb52907637ad768cac4c97af1b39f7ed68a361a760788b7581c54caed2bdbe41
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9891

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://mamotato.ro/userfiles/file/47391954791.pdf In PDF document text
    • http://atomiccm.com/userfiles/files/dopejelujigazexepen.pdfIn PDF document text
    • http://cavusofis.com/images_upload/files/delejetejofated.pdfIn PDF document text
    • http://chinajessie.com/seadata/data/uploads/img/file/162421184354.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210610215611692.pdfIn PDF document text
    • http://mega-treid.com/userfiles/files/kijewoj.pdfIn PDF document text
    • http://namhungholdings.com/uploads/ckfinder/files/wagevuvipalifaforoneb.pdfIn PDF document text
    • http://alexsrmenchion.com/clients/b/bf/bf5401b25fe3457642f5a6f1150d5537/File/popiwulademijexajup.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/160fa9f062ac9d---geteze.pdfIn PDF document text
    • http://longvu.vn/Images_upload/files/97214721329.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160775c72adbb1---93058365462.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/40ffa9e4b509f7ea19bc5d71099ac82c/11809085366.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/d657f31967b928cdfa6e045976778305/kovorusibedimuxerodixubek.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/eb2366df7d1ab57f77583d0f130a8e86/saxenetixotomivafegi.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/0829c7a675376f7f9bb5f7086fa76128/6527336982.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/5m6obfkv7ove2p8jmh5c9ph3j3/supirisisepexewesubikogo.pdfIn PDF document text
    • http://ghioroiu.ro/sites/default/files/file/latowarozimaximog.pdfIn PDF document text
    • http://lycee-elm.org/userfiles/file/kobapejolida.pdfIn PDF document text
    • https://lesura.net/userfiles/file/sodatikoruvumivenepas.pdfIn PDF document text
    • http://studiomarazzi.eu/userfiles/files/zeguzivadukizirosadojet.pdfIn PDF document text
    • http://esthebel.de/userfiles/file/sofuk.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160885ef90f16b---dibese.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160928a157e2f6---20857691090.pdfIn PDF document text
    • http://kahounova.cz/userfiles/file/wezifesojumivad.pdfIn PDF document text
    • http://maymaygiaydachidang.com/upload/files/23537876050.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=aha+bls+test+questions+and+answersPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010ea3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EA3 18060 bytes
SHA-256: dd6ab405ca7cd59d3e6d92bee9b067f98bbb7d4374dc35af02e90c7e606a5c2e
font_01_sfnt_off00013daf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DAF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000155c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x155C0 16084 bytes
SHA-256: 629677e45faedee601e08dfe5d93bed8cb2cbab2933fb40e48fc5543807047de
font_03_sfnt_off00016af7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16AF7 10800 bytes
SHA-256: 15c43354f39019f77a880056058cabc944830510f6f9aeee818999505788603d

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