Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6cde9aec9429949…

MALICIOUS

PDF

81.5 KB Created: 2021-09-08 21:28:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d2424bf248c5bf134fe9073311c4636a SHA-1: 50f9f3914a92c7da2931dd228c71566da481ed78 SHA-256: f6cde9aec9429949fcb0e7a52fc45a57d5fbb8159e538ffdf867b02fa20a20a3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to lure users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 https://budgetparking.ca/admin/uploads/file/fefutiba.pdf In PDF document text
    • https://linhngapt.vn/upload/files/nirorelif.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/16138037e1bcdb---folefawoxusivexa.pdfIn PDF document text
    • http://asea-admin.com/_userfiles/file/20210906160158.pdfIn PDF document text
    • http://simoncaulkin.com/images/45672572889.pdfIn PDF document text
    • http://jmvlpslimited.com/ci/userfiles/files/kigurag.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/161303e9134d74---17385130150.pdfIn PDF document text
    • https://maciejabramowicz.pl/upload/files/file/zoronefovagadowegurebokuj.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/6ntiuhisif13mq8gd36r7p9uj6/dufajorunapetobokigotos.pdfIn PDF document text
    • http://1night2day.com/ckupload/files/kezevosatedulinilebavaxat.pdfIn PDF document text
    • http://originalbau.hu/imagesfiles/7576026968.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/37c5bfc97a9a2b084fb17d5d4d7878dd/mozajir.pdfIn PDF document text
    • https://pima-alarms.rs/slicice/file/nelonojexunag.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16134ddc3bf083---45023479969.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/pq89dspfjfb5shr3j9mupgbfe3/26012434944.pdfIn PDF document text
    • https://hoangmailogistics.com/asset/site/files/kozunazigobipu.pdfIn PDF document text
    • http://sloplast.com/userfiles/files/zazovibatimujolufisuwel.pdfIn PDF document text
    • http://www.plain-pied.com/editeur/ckfinder/userfiles/files/1120031209.pdfIn PDF document text
    • http://f-okinawa.com/img/tmp/file/magibuj.pdfIn PDF document text
    • https://divetechmarine.com/contents/files/rivabenuzeronim.pdfIn PDF document text
    • http://salman-is.com/userfiles/file/suralifepobizedawo.pdfIn PDF document text
    • http://vindindex.nl/images/uploads/86223032475.pdfIn PDF document text
    • https://widepolymers.com/userfiles/file/95269368013.pdfIn PDF document text
    • https://emenu.hu/editor_up/tobegevo.pdfIn PDF document text
    • http://djarkitek.com/temp/vinney/HTML/userfiles/file/31436359138.pdfIn PDF document text
    • https://megashina24.ru/files/files/99808031538.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=arranging+words+in+alphabetical+order+worksheets+for+grade+1PDF 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_off0000d622.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD622 11252 bytes
SHA-256: e74585554ac313db33a385ee3dfb4901b9486fcc193de90427b980d4de977555
font_01_sfnt_off0000f023.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF023 18496 bytes
SHA-256: 5263339840646c9ddda0b9d8b228d93b7afa29bbff8041d7a6a1879f963e8cb9
font_02_sfnt_off00012013.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12013 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1