Malicious PDF — malware analysis report

Static analysis result for SHA-256 238035de6c03d4f3…

MALICIOUS

PDF

89.3 KB Created: 2021-08-05 08:27:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c421b2888319d5d46de57b6592748b2e SHA-1: 05e24e8b1be4d0dcec90f9aa5b22f49924803b02 SHA-256: 238035de6c03d4f393f1131688ebe94e3bd364079fb8a226949bd7ba27c4aeaf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or are part of link farms on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 6

  • 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.
  • 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://drafthe.ru/uplcv?utm_term=guided+sleep+meditation+story+2020 PDF link annotation
    • http://labsshop.com/d/files/jadabo.pdfIn PDF document text
    • http://cuadepthanglong.com/images/ckeditor/files/nesokirafikanimaro.pdfIn PDF document text
    • http://buffagiuseppeinfissi.com/userfiles/files/fukusurarito.pdfIn PDF document text
    • https://tarzminder.com/resimler/files/17565900120.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606e4f1f2c37d---90275840874.pdfIn PDF document text
    • https://jamuiboe.com/webroot/upload_media/96114952086.pdfIn PDF document text
    • http://faulkfamilync.com/clients/c/cc/ccb94402b1eed20a0583117be0c0b506/File/zubuxobifidewuzakut.pdfIn PDF document text
    • http://drivingschool-brno.eu/files/80616155856.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607c75d85ac2f---fazuvek.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/16081f924f31de---duzubagovenopow.pdfIn PDF document text
    • http://jtylek.pl/Upload/file/majeketiw.pdfIn PDF document text
    • http://iphysiology.ru/upload/37090895008.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607920767f713---56422301620.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d0bfe94f654---bafazepe.pdfIn PDF document text
    • http://c2r-auto.com/uploadfiles/file/2021062019044073499.pdfIn PDF document text
    • http://dostavkaturov.ru/files/file/3694916056.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160705a7b2005f---rofulanatofuguno.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad0e0861669---59774651215.pdfIn PDF document text
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/cd040e15d50d8190cd4d069db7a2242a/ropetijalumezaxu.pdfIn PDF document text
    • https://samsungvrvklima.com/upload/ckfinder/files/ranubirotef.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/16071a1bba3b36---57394112424.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bc93e9d9a1---dukavoniwi.pdfIn PDF document text
    • http://www.anieliasfx.com/uploads/textareas/file/fatobapan.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/3b0bf2cc7152fcc4e1d7736c1cd1c310/wugizinafudeji.pdfIn PDF document text
    • http://kleiberit.ru/files/file/89578265220.pdfIn PDF document text
    • 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_off0000f7bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7BF 11048 bytes
SHA-256: 922e039ff61e8d5210d0c18152a43976a059fefd7978151f1fd1eab8ae6f6ea3
font_01_sfnt_off00011189.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11189 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001299b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1299B 16732 bytes
SHA-256: 0ebf2cbf3567ae7a61acc41f754498f84e4878a5ba5830b23c87ec4813cf5540

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