Malicious PDF — malware analysis report

Static analysis result for SHA-256 20935e92abb68d65…

MALICIOUS

PDF

83.9 KB Created: 2021-07-07 23:16:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: fdd69c70b2e00d9ab8e1b42ae92ad88a SHA-1: adf698d0754d87990b3a209f8157585848e2e417 SHA-256: 20935e92abb68d65ff7e4910bb650e2be2f05e0fba87326d45d60bdb81da62b2
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it functions as a link farm. Multiple URLs point to compromised CMS uploads and disposable hosting, suggesting an attempt to lure users to malicious sites. The document body is heavily obfuscated and contains no readable content, reinforcing the interpretation that its primary function is to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://centrobrands.com/wp-content/plugins/super-forms/uploads/php/files/3815f5793b24d6fd614ff0452c248284/fiwuduke.pdf In PDF document text
    • https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/e1ghug60k7sfpqk3poh9mjdmi5/72651144702.pdfIn PDF document text
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/pceqbgotoe2kr42ipdjavibtvr/maboparo.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e146e1455a---51198361160.pdfIn PDF document text
    • http://akssert.com/userfiles/files/72591797774.pdfIn PDF document text
    • http://hoadondientu-ptp.vn/images/ckeditor/files/83934914505.pdfIn PDF document text
    • http://vivaldiskibus.com/FileData/ckfinder/files/20210703_5E4FF4F8E59237B4.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/ibvklt5f84jcdf5bn5bdtt6gm7/nuvikaxobitorokub.pdfIn PDF document text
    • http://3qbuy.com/CKEdit/upload/files/xunepinamatem.pdfIn PDF document text
    • http://nghiencuuykhoa.com/uploads/userfiles/file/70207204047.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f3f5a06f04835c9846e14e0b54088c6b/dedopebazewetewit.pdfIn PDF document text
    • http://aven.su/userfiles/file/jeguxewim.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/v48abm5bct41m4np5qm4dd2ak5/13967773648.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/0v2e83d0ka55ou1819d4anjrg3/49548033837.pdfIn PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/kasinimiwamuzen.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607315058f5ea---muvowomanunowaxevavoxa.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/5d6ac4afe6f33e9e51dfffa7f5d17b66/dilatedidobezilokubupobi.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/93a83023e7f7b887284f323ccc477dce/66915616093.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/91b1f6a55d6e0c79710d1bcdd5553e62/29917349547.pdfIn PDF document text
    • http://www.cenlajobinator.com/siteuploads/editorimg/file/38641993184.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/hfvts140giohdj2q7hnllnjomg/12774257299.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bfc90117bca---werimilurofexumep.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=grouped+punctate+calcificationsPDF 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_off0000e610.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE610 16632 bytes
SHA-256: a293b5b7682c69308cc12713ae39a6d02ab0ac93cf9340667f677ace80bf9835
font_01_sfnt_off00011169.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11169 10752 bytes
SHA-256: a78c36600af71cc04cd72af98a97d576a4abf2cc0ce6418df080bfa83322600a
font_02_sfnt_off00012a3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A3E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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