Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0ebd4aed0a3db46…

MALICIOUS

PDF

90.1 KB Created: 2021-09-02 12:08:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: cd73937936778cda2bed7643c433e535 SHA-1: 0788d409cbefb77dee1887025fee3e0b3113219d SHA-256: d0ebd4aed0a3db46f276a048ac7e51fbcfaa3fee1ac821037a7fcc7b0f788aa7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics suggest it functions as a link farm, potentially leading users to download further malicious content, and includes an invoice lure. While no scripts were directly extracted, the PDF structure and embedded URLs point towards a phishing or malware distribution scheme, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://fototipia.hu/files/files/83927046974.pdf In PDF document text
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/kj0p690ggfvdfp0mt350j24rdc/dalizo.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/nibadipatujunuwufuv.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/26778269641.pdfIn PDF document text
    • http://imapbook.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/gamepodufesojud.pdfIn PDF document text
    • https://kcss.hu/korosi/userfiles/file/30630941857.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/032637d7320ff70717c43dc384b59f2f/butarozefawe.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b298ee19b6---xopipat.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608b535324a42---miliguzetomov.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a984c2a4be1---nidirusakesevoxez.pdfIn PDF document text
    • https://sofupingame.com/calisma2/files/uploads/49317363463.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087b2cb1b2c3---modagomawasegotejusenili.pdfIn PDF document text
    • http://vdadanang.vn/app/webroot/assets/files/68987955806.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/f889bb0809d0a834cd8e27441aee769b/22138356089.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/160c2bae6c9f6b---kufiti.pdfIn PDF document text
    • http://bugaboo-buffalo.eu/UserFiles/File/rujegezojemuwebapesafiju.pdfIn PDF document text
    • https://k-barrierfree.com/FileData/ckfinder/files/20210623_BD3CA563496B9793.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b113ce4759d---64740527391.pdfIn PDF document text
    • http://kimbuunguyen.com/uploads/userfiles/file/54312510732.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a7415b6f1a---guwusitorusexi.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/94d50798ec78335e27f5e3f1d01b3a0b/rudutomijowinaviri.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles/file/65703097119.pdfIn PDF document text
    • http://dhsclassof70.com/clients/d/d1/d13f49183e6b2ef720c1f353b43de0f2/File/74509570627.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/6c4006c1dc43c13bda926094213d8175/7977818886.pdfIn PDF document text
    • http://fixmyhelicopter.com/project-new/christianbook/upload_images/file/dizevunosozakubolasi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=oven+selector+switch+manualPDF 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_off0000fb71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB71 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011388.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11388 10772 bytes
SHA-256: 5adccf76458a4773d2e0e84188ef3b94252fe7a3c0cdcb916f3d522f3345ab3a
font_02_sfnt_off00012c3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C3C 17988 bytes
SHA-256: 41eb0d36dc5bb9a66df87e43391b34d68382b05b3961e70c032117476cbacad3

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