Malicious PDF — malware analysis report

Static analysis result for SHA-256 10eb59758d6e3f77…

MALICIOUS

PDF

83.2 KB Created: 2021-07-06 19:59:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7365364be17924db1cc3547ca3afb842 SHA-1: 370de33b6a7cf8efa2e5ce0aa03e28db12471886 SHA-256: 10eb59758d6e3f77109be290f135770194a709d625c99e26edc317264b622004
156 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised WordPress sites, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, pointing to a tactic of using disposable or compromised hosting for malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071f5eff0729---japuderavilev.pdf
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/76250694eba937d2993cdc203a4293a4/12616238386.pdf
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/16086ada392df9---vivupudezuvofimi.pdf
    • http://tcihk.com/userfiles/tozidasubuluperilamak.pdf
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/54f86d92305196a8594736671816868e/28360153887.pdf
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/fab295dc8c539bc631e901ecfe63263f/lizik.pdf
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/0i8ol8s20m91l7l0844b2gcb6f/ridozexino.pdf
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a46d3ee8112---bepomofis.pdf
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/1606e4cf723fad---25334767504.pdf
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/3f34kp2aqk1kksrgq9diqb3s46/63740864722.pdf
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c25d511de5d---jakadibimunovexumoloref.pdf
    • http://vtdsbinhthuan.vn/public/uploads/userfiles/file/90823365620.pdf
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fb5f756cd7---4616046994.pdf
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acbb011f9eb---42475974344.pdf
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b14df592cc2---70565600586.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a9a53c7c3c---sufik.pdf
    • http://xiaohecollege.com/d/files/mosemotarawozojodotat.pdf
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/j0hujefp00hqph1n26j07plvq0/14509509545.pdf
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/18e51e2c05a7e1df8340db19cb31cbcb/sazatedu.pdf
    • https://alshamiltrading.com/alshamilfiles/file/11516950043.pdf
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/c2cdda6c1df1c6811a819ab3b2edce04/bebud.pdf
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/49b96900ecdfb1d6b9ac7400ef6420ff/tixadisabijogoximojobovuf.pdf
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/b5a499c7ade04fbe7dd57609d5490d24/gebavevosokofivotaxewof.pdf
    • https://stpeterscbs.ca/ckfinder/userfiles/files/15108067257.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=call+of+duty+mobile+transparent
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e3df.bin
c0cc9ba941fed744d1647dece18dbbb3051b727a5e65e73daf73e2836017c636
pdf-font-stream PDF embedded font (sfnt) at offset 0xE3DF 11044 bytes
font_01_sfnt_off0000fd68.bin
bf6431e46069daa61a34f45d8ed0da6a4c6af9371198b4b67d8a8f040d7b4afb
pdf-font-stream PDF embedded font (sfnt) at offset 0xFD68 16260 bytes
font_02_sfnt_off000127ab.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x127AB 16792 bytes