Malicious PDF — malware analysis report

Static analysis result for SHA-256 8faeb40764b8289e…

MALICIOUS

PDF

85.2 KB Created: 2021-09-16 18:58:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c3817a1bb27889109a3744facfd9fef2 SHA-1: 116835207d1ad87b59a661a7829a256475124f07 SHA-256: 8faeb40764b8289e7d97a2824ee8ccc92f16be5e8791d1153f79f5af42abc70c
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 compromised websites or disposable domains, indicating a link farm designed to lure users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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.
  • 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://coretry.ru/uplcv?utm_term=best+free+app+to+transfer+data+from+android+to+android PDF link annotation
    • https://consultingexpert.eu/fckeditor/userfiles/file/46396811510.pdfIn PDF document text
    • https://jotelek.hu/files/file/37715108956.pdfIn PDF document text
    • http://homeopathyhongkong.org/files/34677379137.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16133c4b854842---rozisobiked.pdfIn PDF document text
    • http://tdvvietnam.vn/webroot/img/files/47513363632.pdfIn PDF document text
    • http://solarhomepage.ch/fckeditor/editor/images/file/53758714726.pdfIn PDF document text
    • http://www.mbk-montage.nl/ckfinder/userfiles/files/33754206642.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/df97fdecf462c5f5605f009b35826aab/39727042304.pdfIn PDF document text
    • http://hanmih.com/userfiles/file/20210906063135.pdfIn PDF document text
    • http://mfo-fond.ru/ckeditor/ckfinder/userfiles/Images/files/20910814986.pdfIn PDF document text
    • http://friulanamarmi.it/images/file/pefamitobogatafim.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/8e1cf3f05085877730a055f40fb58564/vonikajifilepa.pdfIn PDF document text
    • http://dvarenda.ru/upload/file/bujitajaz.pdfIn PDF document text
    • http://diagnosticaedilizia.com/userfiles/files/14997427380.pdfIn PDF document text
    • https://marosme.ro/hirek/file/34371046501.pdfIn PDF document text
    • https://tomorrowhubs.com/upload/users/files/39593601689.pdfIn PDF document text
    • http://auksozvynas.lt/userfiles/file/julite.pdfIn PDF document text
    • https://allcondosales.rodeodrivecondosale.com/userfiles/files/8462837200.pdfIn PDF document text
    • http://gardensyellowcab.com/admin/images/file/16658281838.pdfIn PDF document text
    • http://jikaramen.com/uploads/files/6323031184.pdfIn PDF document text
    • https://red-adlay.com/upload/files/puxigezorumiruregege.pdfIn PDF document text
    • https://www.carnesvarejo.com.br/assets/ckfinder/core/connector/php/uploads/files/fijofagidonipegesewopod.pdfIn PDF document text
    • https://expomediainc.com/upload/file/gilevom.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_off0000e90b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE90B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001011d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1011D 17276 bytes
SHA-256: 5f45ad1c192dc22ea4c1004219ee75747ce406ae67a151ac49ad7a9bca014eb6
font_02_sfnt_off00012de4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DE4 10664 bytes
SHA-256: fabe62555645f0eaad6bc0818af89d850f3cfb3c878af20d9df9697023cfb19c