Malicious PDF — malware analysis report

Static analysis result for SHA-256 9956279812c4ba1c…

MALICIOUS

PDF

74.5 KB Created: 2021-09-12 12:11:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e04c67870c8935d87f66fe6fce6615ac SHA-1: eae947b0a2dd6cb055b1a74bbaeeffb1ce5238df SHA-256: 9956279812c4ba1c4677435101372674fbc9c02589720b215bda0b9fb495a64d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which appear to be hosted on compromised or disposable domains, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and link farm nature are indicative of malicious document techniques.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://chcial.ru/uplcv?utm_term=tulip+fever+full+movie+watch+online PDF link annotation
    • http://geerhannutpourreussir.be/docs/upload/files/nataronaxofemem.pdfIn PDF document text
    • https://habibitours.org/ckfinder/userfiles/files/dovijirulober.pdfIn PDF document text
    • http://digitalqwerty.com/ckfinder/userfiles/files/98532820382.pdfIn PDF document text
    • https://vico-immobilien.com/ckfinder/userfiles/files/90145937310.pdfIn PDF document text
    • http://electric-kernbichler.at/66584624603.pdfIn PDF document text
    • https://pernambucoimortal.com/imagens/files/fitemikedozogijuso.pdfIn PDF document text
    • http://pivotal-technologies.com/userfiles/file/8867306903.pdfIn PDF document text
    • https://cashcruis.ru/wp-content/plugins/super-forms/uploads/php/files/f5258c7ce7c547ecd4c7cc640c4022cf/88216126517.pdfIn PDF document text
    • http://jobsandhi.com/uploaded_files/userfiles/files/kimofaxojedopov.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132f231dc143---33809587895.pdfIn PDF document text
    • https://oxfordjsr.com/userfiles/file/zubuteziz.pdfIn PDF document text
    • http://xn--80aadq3ae7aa5k.xn--p1ai/upload/file/dulive.pdfIn PDF document text
    • http://solmoda.it/userfiles/files/66858272833.pdfIn PDF document text
    • https://kga-am-adlergestell-ev.de/kga/ckfinder/userfiles/files/retobumukesomatutij.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/16136555541599---59133442444.pdfIn PDF document text
    • http://cncforginghammer.com/d/files/73377094019.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613b77b08d04b---18337278932.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/7290f67cbc99f635321b565b4237a09f/duzadesuzavozeturutid.pdfIn PDF document text
    • http://naim.naparts.com/images/fck/file/8075356286.pdfIn PDF document text
    • http://parateam.cz/file/16021050415.pdfIn PDF document text
    • http://nexxosrealty.com/userfiles/files/sibowokitir.pdfIn PDF document text
    • http://poptheme.cn/uploadfile/files/20210907_062144.pdfIn PDF document text
    • http://www.singchai.co.th/ckfinder/userfiles/files/60278015126.pdfIn PDF document text
    • http://www.dawnrotaryclub.tw/UserFiles/files/57836382661.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_off0000c0f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0F1 10792 bytes
SHA-256: 7b664e82b7d169c6e11015bbc6cd8d56e49e01859197409a168aea228c40665b
font_01_sfnt_off0000d9a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9A9 16472 bytes
SHA-256: f76c74e05d6d4228f4492bdf30171d2802e87e3fac9a9c8bb1e1dae6839da26c
font_02_sfnt_off000103b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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