Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2f0c91d92fe2184…

MALICIOUS

PDF

105.2 KB Created: 2021-09-24 06:58:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ec5b8ee66addaf5ff641deb14cda5d42 SHA-1: 526f93c28c981177804b610d174d43a127959614 SHA-256: c2f0c91d92fe21840f173cfccba66dbb661492720a1a4efa51659bf45393200f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the presence of external URIs and the overall structure point towards a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://pixomot.ru/uplcv?utm_term=toefl+structure+practice+test+with+answers+pdf PDF link annotation
    • https://cubic.is/userfiles/file/77222436267.pdfIn PDF document text
    • https://normec-cm.com/ckfinder/userfiles/files/49936973728.pdfIn PDF document text
    • http://piscesappliances.com/userfiles/file/toriwijog.pdfIn PDF document text
    • http://hidrometa.com/images_upload/files/42983243616.pdfIn PDF document text
    • http://mdknoodles.co/uploads/files/9619353020.pdfIn PDF document text
    • http://jsdarvin.com/files/zumenefajupawogirelu.pdfIn PDF document text
    • http://a2hgghk.handylover.com/upload/files/kajosamawox.pdfIn PDF document text
    • https://kientrucqhouse.com/uploads/image/files/25693586922.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/6438a68780aad8fc9cf610e5093e7641/76705396.pdfIn PDF document text
    • http://kechengchem.com/upload/files/67384648962.pdfIn PDF document text
    • http://singer-island-condos.com/userfiles/files/betogo.pdfIn PDF document text
    • http://lisaarkinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/47877817366.pdfIn PDF document text
    • http://automozg.by/upload/editor/files/zitamajukewapakumosek.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7e30efbe0cc9115a0afe01561b6e144f/26001986236.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/tafewuloguwigobumusujivep.pdfIn PDF document text
    • http://the100voicesofgospel.de/fichiers/newsletter/file/sixilibixotexitefolozor.pdfIn PDF document text
    • http://xn-----6kcaheblih5ab0a6afqbzoqe.xn--p1ai/ckfinder/userfiles/files/fomesov.pdfIn PDF document text
    • https://calprin.com/ckfinder/userfiles/files/jewegidob.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613e5ca0316e0---81945785608.pdfIn PDF document text
    • http://slxiang.com/v15/Upload/file/20219191219369161.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613a254a5b508---30964077129.pdfIn PDF document text
    • https://perfecthospitals.org/FCKeditor/file/95904116403.pdfIn PDF document text
    • http://kondicionery-pushkino.ru/upload_picture/file/69851952236.pdfIn PDF document text
    • http://platcometals.com/images/file/80306002254.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_off00013713.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13713 17972 bytes
SHA-256: 0ba58c028452a4c6f57acc9117c59547c45cd74f12df969c0d892f03dc297e05
font_01_sfnt_off00016595.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16595 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00017dac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17DAC 10864 bytes
SHA-256: 1e81245d785fcf6a7565dc93990542d2ef9c12bfd72fb9af7ea71e53310bcaa7

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