Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f90492e40295cdb…

MALICIOUS

PDF

64.0 KB Created: 2021-06-11 03:02:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: bd87bac2bb29b816ca40cc12deacf047 SHA-1: a0098cc27a1b7fd83308aa2bcd69c0f391b3e63b SHA-256: 1f90492e40295cdbd2ff28d44b81c349ba67dd10aba414832ff3d5d652975384
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document functions as a link farm, directing users to download a 'mod apk of coin master' from various compromised WordPress sites. The presence of multiple links on disposable hosting and the ML classifier's high confidence score indicate a malicious intent to distribute potentially unwanted or harmful applications. While no scripts were directly extracted, the document's structure and embedded URLs strongly suggest a phishing or social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8681

Heuristics 5

  • 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
  • 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://catamma.ru/uplcv?utm_term=mod+apk+of+coin+master PDF link annotation
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/1dba61fd816581fa09e9b39314acc0d2/baketet.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/96c1c998553890065cb96f164918a30c/91786831002.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/p1cct6s3shqaohn57n089d1l42/45440683836.pdfIn PDF document text
    • https://aplusadvance.com/naver_editor/data/file/xixojimivubenejikax.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1e3350363---govari.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609a378b953ff---pulapetezegovijire.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160b0a32c0b010---xofidovevenogedi.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609036bd7a219---28719596644.pdfIn PDF document text
    • http://alibabashipping.com/userfiles/file/juletesutagodagari.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608390a3a009f---raxilubenederoribivumo.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/vean5sm02k77qo84bnm1v1c9em/23895169467.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/5e1e09623f176b7814ff8978f2db5a22/jiwip.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/70389ca589fa1055cf49eb0a59fee06c/nojakaj.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160739ccbcb904---2303342407.pdfIn PDF document text
    • https://bikidi.com/UpFiles/WebEditorFiles/file/noxemuxedexifi.pdfIn PDF document text
    • http://robbinsfamilyhealthcare.com/clients/2/2c/2c787fa606fc56c3a3a24dfc5409695f/File/89756857861.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eae0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAE0 5124 bytes
SHA-256: c54fa4abc7f0e878bf6ac1de03b1aa75a24c204ec63a4e543bfb823262b3c8f6

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