Malicious PDF — malware analysis report

Static analysis result for SHA-256 6743ec22b922ab6c…

MALICIOUS

PDF

81.8 KB Created: 2021-06-30 19:11:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 007214c621178ad83dbd184b11f1a1fc SHA-1: a6758293e1db89d0e37a2d68cb6e869beacfec3c SHA-256: 6743ec22b922ab6c6c30c480ebd76ec43fd9053f8f5c60665e0029b126f6d058
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple external URIs and link farm patterns, indicating a likely attempt to redirect users to malicious sites. The ClamAV detection and ML classifier strongly suggest this PDF is malicious, specifically identified as a phishing trojan. While no scripts were directly extracted, the embedded URLs and link farm structure point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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=download+game+gin+rummy+mod+apk PDF link annotation
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/68fbbe475e9a3dc57a2b87770d7a45ad/11007444074.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/875cb67e557c0e8c035f1d781b9136bc/seravatozavufinawekikeg.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/a132dfae4efbfe9897ad6aebb101d650/34426507335.pdfIn PDF document text
    • https://laughteronlineuniversity.com/images/upload/files/51064870666.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/d1f826dcf94becc2c4c022b07ebc8afd/nomukojedewugelelojo.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cfcbc6cc2cb---duxatiwovavudulazere.pdfIn PDF document text
    • http://vtvxm.vn/userfiles/file/51440478688.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e56954197d---wuvagatatatenitewavo.pdfIn PDF document text
    • http://www.assignproject.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a248df885b8---85295644420.pdfIn PDF document text
    • http://cuacuontoanthang.com/media/file/nuwisowavilufagugane.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607aede216a01---xasokezevosiwu.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095ea5710efb---bogen.pdfIn PDF document text
    • http://vieclamquantri.net/upload/files/rotuxatufududi.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ea3ffae7c3---tanirarifadux.pdfIn PDF document text
    • http://turinhotelcompany.com/userfiles/files/81443445548.pdfIn PDF document text
    • https://pakistanchristiancongress.org/userfiles/file/fiwudebobu.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/6a8714c1c3efda2d3cdfb12cfaade4a5/kagajuwodikapex.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5b0abb0b3c---juvolijekogepufizil.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6489ae53fd---57071455565.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/kep6ipt453j0gn5oc2edivd2s9/78110925529.pdfIn PDF document text
    • https://facades-et-traditions.com/actualites/file/batozufarekuzujipa.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/q3ih6onten2potc5f0jlps8imm/patisilenuvulin.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bf42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF42 10864 bytes
SHA-256: 17d24e1c30366dec326d8a92aa48f273c520f7fbf4f3f2e48ed93d3c0b77c952
font_01_sfnt_off0000d817.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD817 18508 bytes
SHA-256: 9a585f170b67516c7d26fac669a48c02c14d4b3db91d9bbeca4605fa0c061f21
font_02_sfnt_off0000f513.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF513 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00010d25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D25 16840 bytes
SHA-256: 91cd79720006a1313429589a309f7c882950d0b867ce08feb15a8922098ec2c0

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