Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d7ccd9a58d368a1…

MALICIOUS

PDF

88.5 KB Created: 2021-08-03 21:13:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 6e3c2aef2d6a67c66303013ffbfab802 SHA-1: 65a4e80c588e344baf388cd63aa39ff813d3ae08 SHA-256: 5d7ccd9a58d368a1ce842a73d828771c0ac0996cadc3c2cdf4f63e1ba09bd697
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs hosted on various domains, many of which are associated with compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, and the document body was unreadable, but the heuristic findings and numerous URLs are sufficient evidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610074208b917---degosezikulerogagi.pdf In PDF document text
    • https://mangonebike.com/uploads/file/56003411147.pdfIn PDF document text
    • https://bistakalikotenetwork.com/userfiles/file/pifagozalepotapeb.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/76747024775.pdfIn PDF document text
    • https://hanahana.vn/media/ftp/file/61327560120.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/c1b8390fb80c321900c1d770e8c4a15e/22172791196.pdfIn PDF document text
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/d546e42e9d535c4e8ce0a08203f75e0a/rokutaxovawunaf.pdfIn PDF document text
    • https://bdata.vn/upload/files/pafaseve.pdfIn PDF document text
    • https://faktxeber.com/resimler/files/52750842142.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1378118a04---zewudof.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/765f34aaf9cd702ac4887512b55d192b/zotigupajikeriwiv.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606da03336e06---1118534556.pdfIn PDF document text
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/fe89384a2ce752e10b499616d26193f0/56948425034.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/vut1ph4essa83jnrclgjlo7gsh/88911492353.pdfIn PDF document text
    • http://iphysiology.ru/upload/sisinub.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2f58ebe035---livewemo.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/16077e73d03538---todojesowelogojudavot.pdfIn PDF document text
    • http://sochisushi.nl/survey/userfiles/files/95580942632.pdfIn PDF document text
    • http://tivatijapan.com/uploads/userfiles/file/zepitataretevologotupu.pdfIn PDF document text
    • http://poultech.net/d/files/dodepixujimiguxazuvuru.pdfIn PDF document text
    • http://automotiveenergy.cz/userfiles/file/19633224342.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/ikb8kn6cqbmm909ie90s1chep4/33753628279.pdfIn PDF document text
    • https://serwisnawigacji.pl/userfiles/file/jexujaludinekelorafenus.pdfIn PDF document text
    • https://juhaszautovill.hu/userfiles/file/9543151241.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=linux+command+line+and+shell+scripting+bible+3rd+edition+kindle+editionPDF 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_off0000f3d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D9 17224 bytes
SHA-256: 98ad84ef57206af49544c3eaf40cea1b0cfa5199f6d0eb4608f49d272d661dba
font_01_sfnt_off00012135.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12135 11524 bytes
SHA-256: fb3511c324aad9371c99ca226d874f380636d696af9a940dd588532e0314c449
font_02_sfnt_off00013bee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BEE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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