Malicious PDF — malware analysis report

Static analysis result for SHA-256 774941935fdd9c99…

MALICIOUS

PDF

69.6 KB Created: 2021-09-26 22:11:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b5fa492ce30794ebff9e4ce2b0c2bb24 SHA-1: 4015e80fa07db4fd2419f035f51b143c4e6717b2 SHA-256: 774941935fdd9c9905c57308d68e33f315f1e02f8c26a64d5f8d3700b572aae7
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a link farm with numerous URLs pointing to potentially compromised websites and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the structure and embedded URLs are consistent with techniques used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://pistant.ru/uplcv?utm_term=fake+call+apps+android
    • http://chelseafoodmart.com/uploads/files/34188212086.pdf
    • https://detectagsafety.com/ckfinder/userfiles/files/41587218061.pdf
    • http://chiangmai-clean.com/user_img/files/jefil.pdf
    • https://stollerco.com/testingsites/advantage_aviation/assets/media/file/dutivotikesapakivuvesa.pdf
    • https://fsbulletsandbrass.com/userfiles/files/69267160796.pdf
    • http://erodiertechnik-wenzel.de/userfiles/file/nadukefapiromesitafifavar.pdf
    • http://xn----ctbguteehkho5h.xn--p1ai/ckfinder/userfiles/files/basibopugizumuwajatog.pdf
    • https://rrr71.ru/upload_picture/30679394828.pdf
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1614f33f1c7598---lurogekexakewowakeb.pdf
    • https://giaphutelecom.com/tctt/sites/aaa/file/96656338706.pdf
    • http://clinicaveterinariagoitese.it/userfiles/files/59680122537.pdf
    • http://adas-muko.pl/photo/file/50350800044.pdf
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1614b7d3bbcabf---21586568984.pdf
    • http://ustunongel.com/image/files/nujibimi.pdf
    • https://atamergranit.com/userfiles/file/65496246614.pdf
    • http://thietkewebsite.btccorp.vn/uploads/files/29395042238.pdf
    • https://tucarrorentacar.co/ckfinder/userfiles/files/52179963809.pdf
    • http://xn--12cm8caae5d9a0a0a1dxk6dd.com/user_img/files/wezifemarege.pdf
    • http://ecohort.com/userfiles/files/jurubo.pdf
    • http://oticonshop.net/ckfinder/userfiles/files/zunavunonulazilop.pdf
    • http://sreema.org/FCKeditor/file/bikapafugazutaderosesi.pdf
    • http://gleb777.com/fck_upload/file/bukirikajejulupevege.pdf
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/d974b787bc2737a2ca35b7dd1fea7458/tuvomedo.pdf
    • http://benthanhsgfarm.com/images/uploads/files/26274283389.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b03e.bin
9d0d44901d03960c8437d27f605871cff1e5610ece84c2a79e0b6e82cf7771b6
pdf-font-stream PDF embedded font (sfnt) at offset 0xB03E 16196 bytes
font_01_sfnt_off0000d959.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD959 16792 bytes
font_02_sfnt_off0000f170.bin
918d54bdcf2aefbee62ce991adc17bc08155947b1ba7a7d35c580eb52f6ad985
pdf-font-stream PDF embedded font (sfnt) at offset 0xF170 10476 bytes