Malicious PDF — malware analysis report

Static analysis result for SHA-256 8839897337bac8a8…

MALICIOUS

PDF

80.4 KB Created: 2021-09-01 11:46:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 63dbb044cf1b958f3ca9958660c9b0db SHA-1: d5aa8dae91d24f73a02fa82568b4ad61dbb2b774 SHA-256: 8839897337bac8a8a260564959ad7ca12cd8d69d3ef89c758b7967b216a2c21d
154 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It functions as a link farm, presenting numerous URLs that likely lead to malicious content or further infection vectors. The presence of compromised CMS upload links suggests an attempt to leverage legitimate but compromised infrastructure for distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5017

Heuristics 5

  • 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
  • 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://shqinze.net/admin/upimg/file///mifepunobevofesoki.pdf In PDF document text
    • http://hongdanhaudio.com/luutru/files/34443419295.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/b3cc6fb2b26ee5807c4759021f741f9b/31931311351.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d237d9b5fed---55963730071.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/obhet9pa6ogj2d0tt2q1aftso6/lolafazulu.pdfIn PDF document text
    • https://zohopinler.com/calisma2/files/uploads/jamukazi.pdfIn PDF document text
    • http://mail.teleserviciomalaga.com/ckfinder/userfiles/files/70797970323.pdfIn PDF document text
    • http://annamsaigonlaw.com/upload/files/vipakami.pdfIn PDF document text
    • https://www.brightfieldbusinesshub.co.uk/wp-content/plugins/super-forms/uploads/php/files/cjlf1uittjco3jsaisjmv3p71p/jezezuzinugef.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/chcnn9fv4huh0dd11v77jvr5c4/zazevozuwazinididoduwaded.pdfIn PDF document text
    • http://rideabikenews.com/user_img/files/pagikegajajo.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607001b1c7359---64969152916.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/149d0de4b688b2d800eea9a6a341df7c/86191467367.pdfIn PDF document text
    • http://freeorden.com/media/file/wufatavogega.pdfIn PDF document text
    • http://savalis.ru/userfiles/file/77656141800.pdfIn PDF document text
    • https://elpmarketing.ca/wp-content/plugins/super-forms/uploads/php/files/c78fe94cc44de88e391c02f4c228c33e/18381354112.pdfIn PDF document text
    • http://purpledoorchurch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b831b2975e---dujafag.pdfIn PDF document text
    • http://guchenes.com/d/files/puwuvafugejeraz.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086e1410bee6---48325453495.pdfIn PDF document text
    • https://gberwanda.com/gbe/useruploads/blogs/files/petuma.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fae25c862b---sufovedepajefirakimanifo.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1a657308d6---72018202723.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=chemistry+periodic+table+all+elements+namePDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e92d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE92D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001013f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1013F 18120 bytes
SHA-256: 8a2af359bed1919b4e43670ec9b43efd6012c89ec72ba5f0c0eac48cd8315589

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