Malicious PDF — malware analysis report

Static analysis result for SHA-256 929fa11b58931550…

MALICIOUS

PDF

80.2 KB Created: 2021-10-10 13:30:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: f07fc5704a8a70302066e8b34da1222f SHA-1: 451db1ab40b2bec4c0ddaec604392f105d93f89b SHA-256: 929fa11b58931550183baeb6d47825cd23bfe260b8ff8b751693b96797dc1095
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various websites, many of which appear to be compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a link farm strategy, suggesting the document's purpose is to redirect users to potentially malicious sites. While no scripts were explicitly extracted, the nature of the embedded URLs and the ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://vrtaspol.cz/klienti/devel/sneznerolby.cz/ckfinder/userfiles/files/19496984430.pdf In PDF document text
    • http://aotwresort.info/ckfinder/userfiles/files/favimawokesakob.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613e83518c5f3---60313260953.pdfIn PDF document text
    • http://philboyd.com/sapunemusibirejine.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/s24dt1gn2q4vr909q7lh43n3i3/mujupo.pdfIn PDF document text
    • http://grappin-annat-como.com/userfiles/grappin-annat-como.com/file/sowewe.pdfIn PDF document text
    • http://saydersan.com/firma/files/fofimizoliwodapol.pdfIn PDF document text
    • https://fasleh.net/Files/files/fibevawifitonepab.pdfIn PDF document text
    • https://icrs-as.com/userfiles/file/45722854864.pdfIn PDF document text
    • http://dvif.fr/userfiles/file/pifenujurebopikotum.pdfIn PDF document text
    • http://pitchdecor-construction.com/user_img/files/25950138621.pdfIn PDF document text
    • https://jaukiaplinka.lt/ckfinder/userfiles/files/ruzomuzofa.pdfIn PDF document text
    • http://pevak.info/UserFiles/File/22945993354.pdfIn PDF document text
    • http://wmc21.com/ckupload/files/palenevinebowevisavi.pdfIn PDF document text
    • http://rsport.eu/yonexshop/static/file/fusovukuvelokepapuf.pdfIn PDF document text
    • https://livewireeventz.com/userfiles/file/wigodi.pdfIn PDF document text
    • https://cylinder96.ru/admin/ckfinder/userfiles/files/45471731327.pdfIn PDF document text
    • http://lecostationery.com/files/file/fediwafudevuvefusalew.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1615677422032f---91451659649.pdfIn PDF document text
    • https://motecx.com/images/file/zexalopugok.pdfIn PDF document text
    • https://guijek.com/userfiles/file/56028190766.pdfIn PDF document text
    • http://goldendazzle.com/upload/quangtri/files/7974702549.pdfIn PDF document text
    • http://sevenseahotel.com/uploads/images/files/13270568598.pdfIn PDF document text
    • http://bestorkate.com/uploads/ckeditor/files/jobedeluwusox.pdfIn PDF document text
    • http://studiosaletta.it/userfiles/files/niped.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=bitwise+complement+operatorPDF link annotation
    • 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_off0000cfa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFA0 19260 bytes
SHA-256: c2b1841d363b91e4189df079da986381485564bac45769fb744546dcb05fa079
font_01_sfnt_off0001029d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1029D 10676 bytes
SHA-256: 78b5f7bc4cdee55bafab234a7ccc25ca0f3acde54a0573a5945d4f163087f0cf
font_02_sfnt_off00011b28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B28 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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