Malicious PDF — malware analysis report

Static analysis result for SHA-256 6df9fd9aae9cb76b…

MALICIOUS

PDF

80.3 KB Created: 2021-10-15 12:16:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 59135a52b8472aa7cbf30ac0fa2815f0 SHA-1: a39c0a81747801d8b8f64250ee1cb2c2bff46d81 SHA-256: 6df9fd9aae9cb76b899ec617fadfd2ae8f86a6df07dcdef510f36a163416f026
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, characteristic of a link farm used for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to lure users to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://maximatrimony.com/ckfinder/userfiles/files/wukibomuvogun.pdf In PDF document text
    • http://botosani.ro/img/uploads/file/bibugewupixozoma.pdfIn PDF document text
    • http://offerparts.com/upload/files/62841344513.pdfIn PDF document text
    • http://hometextiles-consultant.com/ckfinder/userfiles/files/relara.pdfIn PDF document text
    • https://fokusmedia.com/images/uploads/numosenebo.pdfIn PDF document text
    • http://viettruss.com/upload/file/kisaxowakitafapobeled.pdfIn PDF document text
    • http://dfwsedan.com/nbloom/fckuploads/file/tipaweluselebar.pdfIn PDF document text
    • http://dooroc.com/tk/upload/file/xepewigad.pdfIn PDF document text
    • http://swhwsolution.it/ckeditor-ckfinder-integration/uploads/files/53669511933.pdfIn PDF document text
    • http://galettedesrois.hu/userfiles/file/nisoxinigimoz.pdfIn PDF document text
    • http://kadh.kr/bobod/upload/file/madodulupogafafasokef.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/ff61a8d6af3952ea71974d97193bef03/8839891412.pdfIn PDF document text
    • http://coachhouse.info/assets/file/62404730192.pdfIn PDF document text
    • https://bdblue.com/ckfinder/userfiles/files/sawasalaxipuzamo.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615948f763365---12728676394.pdfIn PDF document text
    • http://ahrestygz.com/userfiles/files/20211001_151931.pdfIn PDF document text
    • https://hasekei.jp/userfiles/file/wagimolozebutuxukemowe.pdfIn PDF document text
    • http://pravkniga.ru/files/userfiles/files/98980561673.pdfIn PDF document text
    • http://szsahsh.com/uploads/files/gapujakidarufomot.pdfIn PDF document text
    • http://ziva-muzika.cz/files/file/27282128803.pdfIn PDF document text
    • http://helices-evra.com/userfiles/file/gavotefakajam.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/v9uoa1vrvao31in187jb5b4ga1/zufemabixowu.pdfIn PDF document text
    • http://ciba.lv/uploaded/file/51171125534.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16151411cc6d7c---nipopi.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/23D8k0Ec_6w/uplcv?utm_term=holding+n64+controllerPDF 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_off0000d46f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD46F 18016 bytes
SHA-256: d0c11d0aec7756b89e3a5aabcd0521f7b487a69a742b029e8b8d7e962e4fd178
font_01_sfnt_off000103d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011beb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BEB 10452 bytes
SHA-256: b4c49298bbef8275edde69980c768615c94189f352386494bf16cd87702d1f85

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