Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdf254683bbab583…

MALICIOUS

PDF

154.8 KB Created: 2021-08-11 18:32:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 5a5de9c6fb4f5736631187c21eec00ee SHA-1: 1722e6e11226af9a209689dd4b82cb95e2f2729c SHA-256: cdf254683bbab5839cea374370d80752b547909ab94588c6e943d681b2ea92bc
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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.
  • 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://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160829a6625aa1---bapapa.pdf In PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/7864a139e708145ca19f78b4b88952b5/jivesifutitot.pdfIn PDF document text
    • http://epmachine.ru/d/files/jafezagiguxowinoxuwinuba.pdfIn PDF document text
    • http://phongkhamducphuc.net/images/files/ziwepalokizulipikipedug.pdfIn PDF document text
    • http://www.giuseppe.ru/ckfinder/userfiles/files/80809533667.pdfIn PDF document text
    • http://abroadster.com/files/11019451379.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/37cb63c8d28b6fedf7ec69aa7e9966a5/bikatijezamu.pdfIn PDF document text
    • https://irepairplus.nl/app/webroot/files/userfiles/files/56420622648.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/8rhevmr9mmp34rl84nddntumdu/sebikuwikapivoni.pdfIn PDF document text
    • http://mxm-hosting.nl/img/editor/file/54394661714.pdfIn PDF document text
    • https://sayurhijau.com/contents//files/6454717352.pdfIn PDF document text
    • http://inglewood1968.com/clients/68690/File/79453413433.pdfIn PDF document text
    • https://aokman-drive.com/d/files/30417116132.pdfIn PDF document text
    • https://detmers-kontejner.hr/files/kemurefatodibix.pdfIn PDF document text
    • http://nextgt.eu/uploads/file/50613821600.pdfIn PDF document text
    • http://yourhealthyanswer.com/ckfinder/userfiles/files/66240410568.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/320c3456863eb0b44fbb321e38d755b3/68450814355.pdfIn PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/tio5572vensdcjmfo4rfdh8mi8/61108026596.pdfIn PDF document text
    • http://wksystems.net/HotelEstimator/userfiles/file/wapevimarepewajabozavigu.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8893b3d9a3---98684397067.pdfIn PDF document text
    • https://www.ideaklinik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f75a3dca8e---63438061179.pdfIn PDF document text
    • http://tanriovermensucat.com/uploads/genel/files/guwumatojasapufaweloloxi.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c894a5018b---womisuguvapelapijo.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16098361b60ba0---manuw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=fixed+asset+register+report+sap+tcodePDF 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_off0001fb28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FB28 10616 bytes
SHA-256: 342ac8215347bd95c44ccdf4003f9ca71b4abb5cfedf074870e92d084e077466
font_01_sfnt_off0002135c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2135C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00022b6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22B6E 18448 bytes
SHA-256: 302b6647c37e629a0991b97b26db7101d40ac6fb219c04f1085b9ef4c6d10ac4