Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb3501241d895e8a…

MALICIOUS

PDF

76.3 KB Created: 2021-09-24 03:56:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ac4f56b929957696564a17ecc94f20e8 SHA-1: e3003e232aa784d9b8e555148ef1586763a7f4c2 SHA-256: fb3501241d895e8a50bde6e9b2fe6880536a4df63549ed2175dea0e8d25c56f7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised WordPress uploads and disposable hosting, with numerous embedded URLs. The document body is heavily obfuscated, but the presence of multiple PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics strongly suggests the file's purpose is to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://crysiq.ru/uplcv?utm_term=the+next+mortal+kombat+movie PDF link annotation
    • http://leprofit.ee/cmsfile/contentfiles/jujififulanatojafejolamus.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/18850147206.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/7159d9a9f647d6d5c4445ca831d242cd/79830626110.pdfIn PDF document text
    • http://sanarina.de/ckfinder/userfiles/files/31869902146.pdfIn PDF document text
    • http://alajwakh.com/uploaded_files/userfiles/files/94664508765.pdfIn PDF document text
    • http://sweet-sugar.de/images/uploadedimages/file/10672622346.pdfIn PDF document text
    • https://arerp.kr/data/file///zotitugovukiguxosatojan.pdfIn PDF document text
    • http://urduhadith.org/survey/userfiles/files/gotolidifamufugugivetub.pdfIn PDF document text
    • https://anbc31.iscriptscloud.com/app/webroot/files/file/kalawuruso.pdfIn PDF document text
    • http://mecateengenharia.com.br/ckfinder/userfiles/files/ribarojutota.pdfIn PDF document text
    • http://instit.ac/ckfinder/userfiles/files/bedimenijuboroxuzis.pdfIn PDF document text
    • http://sk-uralstroy.ru/uploads/files/78204511377.pdfIn PDF document text
    • http://russkiivopros.com/images/FCKeditor/file/65530445418.pdfIn PDF document text
    • https://gizaviation.com/uploads/files/tujedisusetapujik.pdfIn PDF document text
    • http://lynxitservices.com/ckfinder/userfiles/files/loluxekolox.pdfIn PDF document text
    • http://arabic.cz/ckfinder/userfiles/files/85193995607.pdfIn PDF document text
    • http://one9five.com/userfiles/files/8996941741.pdfIn PDF document text
    • https://jeneifogaszat.hu/cikkdata/files/lakirot.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614492d322de0---zedatozoxefugepuzokazowe.pdfIn PDF document text
    • http://etalentlink.com/uploadfile/file///2021090903054570.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/f0a5560a25eaff088b9882bd8e385266/2239448163.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fdf2acbabf---21840962088.pdfIn PDF document text
    • http://tornyanggrace.com/upload/file/pujagigan.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_off0000c4c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4C3 10568 bytes
SHA-256: 348d928f76470c6ff7338f623899b7978cf386490c7a1b722948012f0e44ed5e
font_01_sfnt_off0000dca7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCA7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f4b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4B9 18032 bytes
SHA-256: fed93c112ee72ab59fd795e80787306b884ffadfbc6fe255fb1ec68f3d77a6d3

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