Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2e705e8171c480c…

MALICIOUS

PDF

83.5 KB Created: 2021-09-22 13:09:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9943ec60940505768f556fdaf10de8d0 SHA-1: 95595b59e1cc9e4f8cc6ea4a14f81dcc034b6145 SHA-256: b2e705e8171c480c626de33fa248324688ac92e3d6648234c487d0aad9241cd1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, many of which are hosted on compromised or disposable domains, suggesting a link farm or phishing lure. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further supports this. While no scripts were explicitly extracted, the nature of the URLs and the detection names suggest it may be used to deliver further malicious content or redirect users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://laborke.ru/uplcv?utm_term=movie+star+apk PDF link annotation
    • https://iwistw.com/upload/files/sezekedovo.pdfIn PDF document text
    • https://themalc.org/files/file/rakikagabuwajonam.pdfIn PDF document text
    • http://tzoetemondje.be/uploads/files/gamelepegexakila.pdfIn PDF document text
    • http://mdtrend.hu/files/file/65432451661.pdfIn PDF document text
    • http://bentleyplemtech.ru/userfiles/file/zelasisomapibididunep.pdfIn PDF document text
    • http://eskuvotoszkanaban.hu/editor_up/11118485713.pdfIn PDF document text
    • http://kozelsk-adm.ru/files/uploads/files/xupofasovutonedu.pdfIn PDF document text
    • http://www.louisianarebarcontractor.com/editorimg/file/xudegutebuziwekuwujemolir.pdfIn PDF document text
    • http://noxsun.com/jingkelun/userfiles/files/20210914054259.pdfIn PDF document text
    • http://muntepa.com/userfiles/files/makarogepe.pdfIn PDF document text
    • https://chowdhurytourism.com/ckfinder/userfiles/files/judujigajenoviseligafi.pdfIn PDF document text
    • http://ccshecea.org/upload/files/nolosagizabil.pdfIn PDF document text
    • http://bestpokeya.com/uploads/files/gunisudajuged.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/ttph18ghngpdm1q8slnkgra725/delijumijotefovorapi.pdfIn PDF document text
    • http://arsvet.ru/img/upload/95042992177.pdfIn PDF document text
    • http://erisalaw-chicago.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/ludope.pdfIn PDF document text
    • http://playbabydoll.com/userfiles/file/62503789044.pdfIn PDF document text
    • http://yugang360.com/upload_fck/file/2021-9-5/20210905020038142197.pdfIn PDF document text
    • http://moskvaznaet.ru/upload/files/40705539379.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16135d310b6cf2---90581774849.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/161487afa2c24c---kowijaparukajejugimafokaw.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/572da2756be8f28a53218dff73af392d/65321955612.pdfIn PDF document text
    • http://cartopack.be/Images/file/nedafopodudo.pdfIn PDF document text
    • http://studiopol.it/userfiles/files/dolurugifufudi.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_off0000e70a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE70A 16548 bytes
SHA-256: 9dd5ebc68c65c21b7d051d25809d0e9251d5495ef038b1aa304e1a64ea5ddf45
font_01_sfnt_off000111ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111AD 10244 bytes
SHA-256: 47c4d50143216f03a527b75140dc4866c56681b288268489fd68793682e26e5a
font_02_sfnt_off000128f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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