Malicious PDF — malware analysis report

Static analysis result for SHA-256 25a70ccbac346c29…

MALICIOUS

PDF

86.4 KB Created: 2021-07-21 22:36:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: fbad2123cd9da3575b61650d3dbf0968 SHA-1: 12fa6bb8b92eb92190e8946f21946a1136410275 SHA-256: 25a70ccbac346c29cf2c73de010ca0f09cada2f4cc65291c385e21c817e06cc5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ClamAV as 'Pdf.Phishing.Trojan' and an ML classifier indicated a high probability of maliciousness. It contains numerous links, many pointing to domains associated with compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of multiple PDF link farm heuristics and embedded URLs supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://techson-cctv.com/upload/file/wodubamisiperujibamaxigu.pdf In PDF document text
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1607b51c3be53a---zinosuvijupedasasogew.pdfIn PDF document text
    • https://baatco.com/ckfinder/userfiles/files/42699489140.pdfIn PDF document text
    • https://kheops-so.fr/ckfinder/userfiles/files/58456411422.pdfIn PDF document text
    • https://blv.by/upload/editor/files/tabibamevi.pdfIn PDF document text
    • https://walkandsmile.com/userfiles/file/lowogakowiraxikef.pdfIn PDF document text
    • https://medtek.vn/storage/file/penutenu.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/99ttmeqeocnui4q97447pmjcg5/33762105070.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a53e9f2b8c1---56671450256.pdfIn PDF document text
    • https://implantsdentairesdesmoulins.com/upload/editor/file/35584605827.pdfIn PDF document text
    • http://stonebriarranch.com/clients/876969/File/87658600463.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/db101dd520331cf17efe70fa3765c6e8/rawer.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/85247526314.pdfIn PDF document text
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/eab8d98a4666a2bf012f8f25b5cc0d95/90426099456.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c9f4e6d283---zumalela.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/160abc0efc343a---lanatof.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/2c59fc76bd7df48163c29207bb23af68/92080883510.pdfIn PDF document text
    • http://wallacewilliamsfamilyreunion.net/clients/6/66/662ca4338cd1fa41fa93b88222973dc6/File/59390996865.pdfIn PDF document text
    • http://donghozibistore.com/luutru/files/tunafuvugupomijisorez.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606c972d95635---46108756243.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aca67d3c5e3---2370754006.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d507635e9a---16752889742.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607086e4ee180---legizajebixababibeweminim.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/ac65e512a868f264feba7d600453b503/tadad.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=name+the+following+musical+symbolsPDF 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_off0000ec81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC81 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010498.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10498 11100 bytes
SHA-256: 2885b081b118beea43d1471dac5a38da9745a98c7f734a5190414489413b88e4
font_02_sfnt_off00011e63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E63 17476 bytes
SHA-256: 24f2217db1a920ad0084a5d890bb8d0c046227a143a5ba09995424dcdfd66be5

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