Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdeb6f486e1908e0…

MALICIOUS

PDF

84.5 KB Created: 2021-09-04 14:49:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 04df0132cee90d6b4e040569f39cf9b9 SHA-1: 6a4a59bffbb601f5deb6e54a779d1a8b2a2620e8 SHA-256: cdeb6f486e1908e0ef26b7cdb3f40d6827c21b51f4f44ac8a9dddee3b161ffb5
236 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to distribute malware. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The presence of PDF_RANDOM_URL_LINK and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this, pointing to a coordinated effort to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://allytemp.ru/uplcv?utm_term=tcpdf+arial+font+download PDF link annotation
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8b11676a8b---36511884137.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/32249265867.pdfIn PDF document text
    • http://ghhs1968.com/clients/5/57/5762190d0a265df614d1f295a7060a42/File/besogugumefojatawodenuxe.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a420a1d63b4---86002741470.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b7868a1abb5---5997171126.pdfIn PDF document text
    • http://kodemari.info/data/files/sejeruge.pdfIn PDF document text
    • http://ambulatorioveterinariocigliano.com/userfiles/files/20714423097.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/fm5ceg6jkig7rgroq0bglma006/87076501796.pdfIn PDF document text
    • http://fsnmmaterials.com/UPFILE/userfiles/files/49943159111.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160abe3560195b---fokorapemavedikib.pdfIn PDF document text
    • http://www.gonouvellezelande.com/files/88738473985.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160826821ea0bd---nofolulinegow.pdfIn PDF document text
    • http://caycanh.vn/images/fck/file/mawinosegatizavirolunalil.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/51eb0f7b7e65ca87dee4e772b4959d0d/xuzeses.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160997244829e9---wunewajeraxenujo.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/nbe2e47cq9ncmdsile5e806loi/90638929495.pdfIn PDF document text
    • https://greenvalleykerala.com/ckfinder/userfiles/files/liwafukipupakigiwoxi.pdfIn PDF document text
    • http://sxhk365.com/uploads/file///givopixepove.pdfIn macro / runtime command snippet
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/16090f066c292b---fajev.pdfIn PDF document text
    • https://huanghecables.com/d/files/20989281794.pdfIn PDF document text
    • http://fsgpj.com/upfolder/e/files/20210728020513.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608c7b08d45e9---6950060421.pdfIn PDF document text
    • https://zebcom.in/userfiles/file/zavazesamegafo.pdfIn PDF document text
    • http://pogotowienaukowe.com/Upload/file/letakafimutofeje.pdfIn PDF document text
    • https://greenvalleykerala.coIn macro / runtime command snippet
    • 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_off0000e746.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE746 10360 bytes
SHA-256: e265484998cf818502b0e16687cbed5947515d9e4b8e93f8b04912ac0639b4e6
font_01_sfnt_off0000fecd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFECD 17832 bytes
SHA-256: 38ce07e1440394fa667c595d5ac67c5ae30b666a2fd9792964f4f79149bf0ae9
font_02_sfnt_off00012ccb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CCB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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