Malicious PDF — malware analysis report

Static analysis result for SHA-256 caf96f799c7399db…

MALICIOUS

PDF

85.5 KB Created: 2021-09-16 09:36:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 50e713ed4a27d6780dfd6d159c8a245f SHA-1: a4e0dc0611c584ff20612cf8e732f566aca895ee SHA-256: caf96f799c7399db1c311db59e6b2aa9ecf13d63a993acf9e12df9ef631cdad1
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document flagged by ClamAV as a phishing trojan. Heuristics indicate it functions as a link farm, with several URLs pointing to potentially compromised WordPress sites or disposable hosting, likely serving as a lure for users to download further malicious content. The presence of a 'password-protected archive' lure suggests an attempt to conceal a payload from initial security scans.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 http://ladna.pl/user_images/file/tunozajuwolikimukanira.pdf In PDF document text
    • https://malinaionescu.ro/userfiles/file/79015474758.pdfIn PDF document text
    • https://rawoctane.com/uploads/file/46407177662.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613d1142e57e3---30079579209.pdfIn PDF document text
    • https://multimetrics.com/ckfinder/userfiles/files/siduzos.pdfIn PDF document text
    • http://aesg2edcv.handylover.com/upload/files/91350816167.pdfIn PDF document text
    • https://ascii.tn/web/cgi/file/34966266851.pdfIn PDF document text
    • http://cheers-gifts.com/userfiles/ganotalawipojexud.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/161427f40e2d30---20466517095.pdfIn PDF document text
    • http://soundspace.eu/Upload/file/7526185719.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/nqhp36rtv74ngqo01dj1k6ooc1/kadefokexowuno.pdfIn PDF document text
    • https://elegune.net/files/galeria/files/vatifefinabunawawagosa.pdfIn PDF document text
    • http://benetworkingpro.com/ckfinder/userfiles/files/jutagexememumobakor.pdfIn PDF document text
    • https://sunnyrosesschool.com/userfiles/file/49837427863.pdfIn PDF document text
    • https://mediaskills.rs/files/82598617737.pdfIn PDF document text
    • http://phdpecs.hu/userfiles/files/22345630172.pdfIn PDF document text
    • http://elitsatodorova.com/uploadfiles/file/vakatitebanidiliniku.pdfIn PDF document text
    • https://epagneuls-bretons.fr/caningest/images/file/46461266800.pdfIn PDF document text
    • http://gzcil.com/uploadfile/files/gotare.pdfIn PDF document text
    • http://flygarfield.net/userfiles/file/gopurig.pdfIn PDF document text
    • http://signauction.net/userfiles/file/86710440179.pdfIn PDF document text
    • http://rothemtour.com/FileData/ckfinder/files/20210913_32779C27DD87D886.pdfIn PDF document text
    • https://aporpeter.ro/userfiles/file/zikaz.pdfIn PDF document text
    • http://nfraccon.org/userfiles/file/fofubuvaxuromulu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=mario+kart+8+wii+isoPDF 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_off0000e61d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE61D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fe34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE34 10200 bytes
SHA-256: 97dd748a7d7043a55db59f715a6ae8e82a5f441d357af79037169ade0e311972
font_02_sfnt_off00011550.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11550 19368 bytes
SHA-256: 238d03ea1e1db2ec0c2ff652393ecb60ef4f086b1e643c8bdd0094c60590ca9a

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