Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ed9e75812483cdd…

MALICIOUS

PDF

84.0 KB Created: 2021-09-22 11:23:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 000ccb6e700526cb26728ddac5f80596 SHA-1: 16034ab57d71b792a2a751e388b281495e87361b SHA-256: 1ed9e75812483cdd90cf7d58b5c6de65bb05207ef5680865a406f8d6e456a5a4
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 disposable hosting or compromised CMS upload directories, indicative of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is heavily obfuscated and unreadable, providing no direct content-based clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://canhtoanland.com/upload/files/delujinegaditimebuk.pdf In PDF document text
    • http://slenderclub.cz/ckfinder/userfiles/files/wokit.pdfIn PDF document text
    • http://pasted-radio.de/web/files/taxafemegokaxi.pdfIn PDF document text
    • https://myshalewell.com/userfiles/file/21825625945.pdfIn PDF document text
    • http://upakuika.com/img/file/xakefoguwataduzuk.pdfIn PDF document text
    • http://bwc.lt/i/35621028476.pdfIn PDF document text
    • http://sinorarechem.com/upload/files/63726745001.pdfIn PDF document text
    • https://merohamro.com/ckfinder/userfiles/files/doteneloramokumuwolej.pdfIn PDF document text
    • https://proetcontra.hu/userfiles/file/sinaderafadesuwenanuk.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/cbe1158e5de4a76557e6930e80f3d2dd/54499536425.pdfIn PDF document text
    • http://puzynowska-kancelaria.com/userfiles/file/17678490287.pdfIn PDF document text
    • https://pensionradvanice.cz/res/file/7002234134.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144e4ad061de---95259461757.pdfIn PDF document text
    • https://hyundainhapkhau.vn/upload/files/8480284022.pdfIn PDF document text
    • https://kueapem.com/contents/files/lotumoziladiwukixulaxo.pdfIn PDF document text
    • http://makassitools.com/userfiles/file///26543875259.pdfIn PDF document text
    • http://friulanamarmi.it/images/file/vegosofizitizige.pdfIn PDF document text
    • https://printsolutions.printsolutions.bg/uploads/wysiwyg/files/wifuvudabakoliwatagulon.pdfIn PDF document text
    • http://hondasushi.com/uploads/files/jusizajezipukujawomoza.pdfIn PDF document text
    • https://thietbivesinhanhhuy.com/asset/files/88406558200.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16134161cd4a4f---68689822309.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143d7cfe5a31---39591694209.pdfIn PDF document text
    • https://ctsgroups.asia/images/file/75534750103.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=new+pokemon+game+androidPDF 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_off0000e609.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE609 17152 bytes
SHA-256: 6097055be3d713b33d62a80631c624acd66d7a8ddd26f5b9a3ca9c0bcc7797de
font_01_sfnt_off0001128d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1128D 10576 bytes
SHA-256: 4e3163b7a97c83b6c3d2522f3a0b051665d947faa5f261e5442d89d1a9a25b67
font_02_sfnt_off00012a79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A79 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1