Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c456854a3a54a3d…

MALICIOUS

PDF

101.2 KB Created: 2021-07-17 09:19:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: 6cdf70c79193a7b33128e6e923bb1dde SHA-1: d8612214d8f06b143c89730357b1d68259b0f91e SHA-256: 1c456854a3a54a3d42d278cff08a6f491fac36dec99ad8bc27ff1900b81eb66d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous external URIs, many of which point to compromised WordPress upload storage, suggesting an attempt to redirect users to malicious content. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, indicating it's not intended for direct user reading but rather as a vehicle for these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9938

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071175a99584---xojofolixexarakoton.pdf In PDF document text
    • http://armanetti.com/images/luxojifig.pdfIn PDF document text
    • http://solamsys.com/userData/board/file/40547719625.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608da549c803d---zubelovabuwaluragafamuxup.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16097430a49731---befal.pdfIn PDF document text
    • https://absolut-fit-and-dance.de/wp-content/plugins/super-forms/uploads/php/files/n4ql4vrd9r54o22i6hqrkh1jde/12081189755.pdfIn PDF document text
    • https://kme.pl/global/app/webroot/uploads/file/16241260310689.pdfIn PDF document text
    • http://malbreil.com/userfiles/file/24288072058.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f21189ed1df---94944943770.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/b7b3ffc2d59b739ab0fb973698535c45/dapizigijirew.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210622200633134.pdfIn PDF document text
    • http://baudoinfamily.com/clients/f/fc/fc66627f90e8a365851b026dcf169025/File/zonupij.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ed0b5db15e---17781501810.pdfIn PDF document text
    • http://plncse.hu/php_data/file/texaxomoriwoxetomejodux.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/mu1trkdfe1tr11vo4266pjt9g9/51817845131.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/136d57c65a245297f904ce65676cc3c6/84853277349.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/423ccc8977a794f0a8b0546cd22d2561/bosuxiwutef.pdfIn PDF document text
    • http://etenindex.nl/images/uploads/53707855048.pdfIn PDF document text
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/d4807e569f8a134a715a43f569d6ef87/jinowadivefewamebize.pdfIn PDF document text
    • http://t-eamplus.de/web/editor/files/68258685460.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/295ff9e06a6eca9809b9002981de424c/75271554186.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/sunotob.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/f56fc6dc5a094d311b1fbfd9ed06dfa8/bisowadawebasikegilebik.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=as+opposed+to+thatPDF 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_off00011ce2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CE2 23356 bytes
SHA-256: 8764fcb57b5d3f7eefbb10ce2234e1d5bd4c35ccdc564a8301984350999afd3a
font_01_sfnt_off0001570a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1570A 10128 bytes
SHA-256: f201492de12eb5b5dfaf45789ddebaa2ad13106aa5d20b148eeb3d82c486388a
font_02_sfnt_off00016dd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16DD7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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