Malicious PDF — malware analysis report

Static analysis result for SHA-256 79860651da4ec825…

MALICIOUS

PDF

94.4 KB Created: 2021-09-10 16:08:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 414129aaaa825b3773cc7decf14f7a78 SHA-1: 51e41bf4a2790292883d3c63a49e0005d2ad34a4 SHA-256: 79860651da4ec8250290b9017579fd113fee877dec2b5a7b7338fb1d4dbf6639
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript and a large number of external links. These links are distributed across compromised CMS uploads and disposable hosting, strongly suggesting a phishing or malicious redirection scheme. The embedded JavaScript likely facilitates the redirection or further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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=skills+for+the+toefl+ibt+test+listening+and+speaking+pdf PDF link annotation
    • https://braindevelopmentmaps.org/userfiles/files/besegutub.pdfIn PDF document text
    • https://www.habitat-morvan.fr/ckfinder/userfiles/files/46467601789.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b179786ed5---xinelunemigufadepamebam.pdfIn PDF document text
    • http://xyr59.com/filespath/files/20210906080541.pdfIn PDF document text
    • https://www.bankkartya.hu/js/ckfinder/userfiles/files/98192484782.pdfIn PDF document text
    • http://jinyezi.cn/upload/tevovodajipotipozijosabow.pdfIn PDF document text
    • https://kisikana.hr/UserFiles/files/26591787524.pdfIn PDF document text
    • http://gpe-el.pro/ckfinder/userfiles/files/xineg.pdfIn PDF document text
    • http://vektor-bezpeki.com/userfiles/files/8294653527.pdfIn PDF document text
    • https://www.info-service.com.tw/plugin/ckeditor/ckfinder/userfiles/files/97385226732.pdfIn PDF document text
    • https://learnrkb.jugalbandiresearch.com/ckfinder/userfiles/files/zajinegavawowetunanel.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/3cm06v1pthsjj17ucudfv3mep3/48355644511.pdfIn PDF document text
    • http://trendstyleimage.com/uploads/ckfinder/userfiles/files/21032229807.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/3a28b8c2534f068d5ded8fbe4bcf7e6b/22410177529.pdfIn PDF document text
    • http://instalace-charvat.cz/userfiles/file/fewote.pdfIn PDF document text
    • http://riversedgefm.com/files/file/72185900137.pdfIn PDF document text
    • https://nedimgame.com/calisma2/files/uploads/rafogujefofalomiromefimed.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16139968536fd1---segede.pdfIn PDF document text
    • http://cistenivytahu.cz/upload/file/36889761754.pdfIn PDF document text
    • http://moyamoya.center/images/hand_uploaded/files/ginutejagujapizujibi.pdfIn PDF document text
    • http://tiszaladany.hu/upload/file/tikopabapivapupixixip.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_off00010976.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10976 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001218d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1218D 11084 bytes
SHA-256: 5ccab8a8ff96f76346643f1418f73267702588fa85cb2b9c0b5f66960f249e8b
font_02_sfnt_off00013adb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13ADB 18676 bytes
SHA-256: bfe46b4d176eb0e894e930ab24ebabdea083e52e509a2e84d325c74356ddb36f

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