Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3f7e68eeea5eefa…

MALICIOUS

PDF

118.9 KB Created: 2021-09-07 10:05:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f6fd9130eeb7584d7370989e187535d4 SHA-1: bbe9f8e127d26590ea383afb61a53ca7ee195974 SHA-256: a3f7e68eeea5eefa88e7e8d686896afcfb378bede4b8f8eadb46a7e83fafd139
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV detecting it as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised websites or link farms, suggesting a phishing or malware distribution scheme. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' indicates the document is part of a larger infrastructure for hosting malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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://inwebjor.ru/uplcv?utm_term=ayyappa+bhajana+songs+malayalam+pdf PDF link annotation
    • https://ises.ca/phpsites/vertical_living/uploads/file/44031071432.pdfIn PDF document text
    • http://thephinhmienbac.com/upload/files/mokawulijopines.pdfIn PDF document text
    • https://larrialdiak.es/files/galeria/files/wevovuvufidozil.pdfIn PDF document text
    • https://bywuf.org/upload/editor/files/libopakutuxoxa.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/dd50d7944a866f3bac9d0d3471db5dd5/vemazorudusokix.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071405962db2---golegutiwupadenepaselitar.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/58cf85055e00fec2bc26e10e91118c23/takin.pdfIn PDF document text
    • https://fenicia.uy/fenicia.com.uy/uploads/files/11272846451.pdfIn PDF document text
    • http://rubivina.com/Images_upload/files/bosuzeditarotiforilelupaw.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/owimo.pdfIn PDF document text
    • http://muzeumostrowiec.pl/obrazy/file/pakabijutuvox.pdfIn PDF document text
    • http://zagazzo.com/userfiles/file/riwagipofefemevomuwinu.pdfIn PDF document text
    • http://atdawnwelift.com/userfiles/file/57706177655.pdfIn PDF document text
    • https://paklya.su/design/img/upload/file/40208582452.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/vlq4m01bjtvkm5apbrc5a47s74/valizamolikufimem.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/44a4b8cee8f503371116389481694010/wibiwesazidatezopat.pdfIn PDF document text
    • https://www.cascatai.com.br/ckfinder/userfiles/files/37954619000.pdfIn PDF document text
    • http://aimic.com/userfiles/file/ninekuni.pdfIn PDF document text
    • https://whitesal.com/data/images/file/7659_20210623174205.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e21246cb2a0---kupawolege.pdfIn PDF document text
    • http://aquamedia.cn/ckfinder/userfiles/files/66392660530.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8db8de9f5---xupekivodowijageduwetu.pdfIn PDF document text
    • https://cafe-malaysia.com/contents/file/lonogiwowazamudi.pdfIn PDF document text
    • 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_off00016510.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16510 10888 bytes
SHA-256: 1f25be4d1001da89cdce5f182ac94e44b29457e1ad1414e99817faa498133e78
font_01_sfnt_off00017d9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17D9A 21460 bytes
SHA-256: 1fb7b1f3b7eb9c4de87c029c72706121273423dfec8bcbf801faf17128160589
font_02_sfnt_off0001b541.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B541 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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