Malicious PDF — malware analysis report

Static analysis result for SHA-256 351769d3ba9288c8…

MALICIOUS

PDF

69.9 KB Created: 2021-09-15 03:42:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 33d1074bc87096cd37069d9308362ebb SHA-1: 08055facc80792caa5a7120d118696a326904fd4 SHA-256: 351769d3ba9288c80f0f2d8c350cc0ca8a9ab412810fed6c28bf7a760b641a44
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a link farm pointing to numerous URLs, many of which are hosted on domains that appear to be compromised or disposable, suggesting an attempt to redirect users to malicious content or downloads. The presence of external URI links and the overall structure indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://laborke.ru/uplcv?utm_term=nfs+hot+pursuit+apk+download PDF link annotation
    • https://austarpharma.com/upload/files/sinipeduwuribuzip.pdfIn PDF document text
    • http://auto-rad.pl/userfiles/file/pokuxosunubulewesulubopiz.pdfIn PDF document text
    • https://samsungklimalar.com/upload/ckfinder/files/pumefiluzogamemuweg.pdfIn PDF document text
    • https://allcondosales.rodeodrivecondosale.com/userfiles/files/bojed.pdfIn PDF document text
    • https://charlesstreetvideo.com/userfiles/file/fujoza.pdfIn PDF document text
    • http://synphabase.ch/upload/file/61786554221.pdfIn PDF document text
    • http://ensky-chemical.com/upload/files/28404013108.pdfIn PDF document text
    • http://jsushibrea.com/uploads/files/56677941659.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/rete14rd8n2hmavu6u6ra25fu4/57285285270.pdfIn PDF document text
    • http://elazentrale.de/images/uploaded/file/lazigibosaletodolofulo.pdfIn PDF document text
    • http://gsprojekt.eu/userfiles/files/48729947858.pdfIn PDF document text
    • http://www.mousumibanerjee.com/fckimages/file/59475100910.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/084a1efb6a08a0d4001f5132b199084c/nesiwixolodalubajidone.pdfIn PDF document text
    • http://xn----otbbfbbknchz.xn--p1ai/sadm_files/jamivik.pdfIn PDF document text
    • http://newworldss.com/uploads/file/72990062747.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/1odu562u2pv937j9c9os8291cl/81692653357.pdfIn PDF document text
    • http://phonphangschool.com/upload/files/50450517484.pdfIn PDF document text
    • https://jairdefreitas.com/ckfinder/userfiles/files/worikexoto.pdfIn PDF document text
    • http://www.greenfield-sustainability.com/images/files/vevinakix.pdfIn PDF document text
    • https://luiginoiobbi.com/userfiles/file/rugeto.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/50658762289.pdfIn PDF document text
    • http://cornaredo.gattinonimondodivacanze.it/themes/userfiles/files/nupodefoxu.pdfIn PDF document text
    • http://xn--o39a91gvwm83kbsn.com/FileData/ckfinder/files/20210908_8557DE30B327CF07.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/16138fed366fe9---16329403321.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/16141383a77347---87322314660.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_off0000b223.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB223 15472 bytes
SHA-256: 3536ec87e82d1e3c571f45489d8ae17ee9887acfa309fd990561290cb6c565ae
font_01_sfnt_off0000d994.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD994 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f1ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1AB 10720 bytes
SHA-256: 046753a95c1f2c1df48adda525f63b24444bbe6af4a16aaad2a44a367e409c60

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