Malicious PDF — malware analysis report

Static analysis result for SHA-256 517193b6ee4ff3d2…

MALICIOUS

PDF

91.0 KB Created: 2021-06-26 01:51:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3137acd375f391b931abc6575f1fee3d SHA-1: 8a1b43a9bfce5b9ad3d756774b7a572abd654d6b SHA-256: 517193b6ee4ff3d264d5a47841fdb8c2c2a00a0f5fded74d1c0fdcd54b23ceac
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by multiple heuristics and an ML classifier, with ClamAV identifying it as a phishing trojan. It contains a large number of embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of these links indicates an attempt to facilitate phishing or malware distribution.

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://archism.ru/uplcv?utm_term=lil+baby+and+roddy+ricch
    • https://shayangroup.net/wp-content/plugins/super-forms/uploads/php/files/220a0aad23a50c619ad047f151c001ac/sifozivujivi.pdf
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/leb50m2vl47tt5fk44bi02kh1q/zodevuje.pdf
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/b52ca93ce9144e963994021732fc83ef/53035106145.pdf
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609452749fa41---47744227008.pdf
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607c728bd8941---41141169073.pdf
    • https://robotics-institute.com/wp-content/plugins/super-forms/uploads/php/files/lqdr4kuc8keuhtctq4hl7b9fj2/57840277785.pdf
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608254fbd01d0---860552867.pdf
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608709e687ecf---zedabejeximemuwaron.pdf
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160b2b7cb59c9e---27212513286.pdf
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/vp6lf8pa588a3hg6ltjnq8n2s4/zitag.pdf
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609be9c9148f7---pinagiwarexexiwopoxe.pdf
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/0b6ed8f7fb478d4dc43580a275d7eff1/13719070174.pdf
    • http://toeicspeaking.net/_UploadFile/Images/file/69976419260.pdf
    • https://dm288.com/slicice/file/26968929168.pdf
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/14e7cf6046c977aa1ace422ea86d3577/32279092155.pdf
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c8eda862af6---65760954600.pdf
    • https://rdsdealers.com/ckfinder/userfiles/files/boroto.pdf
    • http://jadever.vn/Images_upload/files/76362517564.pdf
    • http://bhttourist.com/upload/fckimagesfile/kopomujutisibima.pdf
    • http://biomassasia.net/data_ed/userfiles/file/97483719191.pdf
    • https://boucherienabli.com/uploads/FCK_files/file/30280345663.pdf
    • http://c-amc.com/upload/files/rexujubobixitofujavoguwa.pdf
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/c52f22dc3ce1b150058881dfe2337e7d/dopusoxarozuzulereru.pdf
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/d854365c5eb129e148b5275e4c6f62f4/fegumagatavibowonabebus.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fd31.bin
3d4c1af689bbcc934b526fad4a1acd4c2103468d46bafd0e9e0087cf0d77856a
pdf-font-stream PDF embedded font (sfnt) at offset 0xFD31 10280 bytes
font_01_sfnt_off0001141f.bin
2111e1e3fd486ae6d4b6882d76df06b4535c6485d6d2a659597d4c0355e54140
pdf-font-stream PDF embedded font (sfnt) at offset 0x1141F 20192 bytes
font_02_sfnt_off000146bc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x146BC 16792 bytes