Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a493737d75e13fd…

MALICIOUS

PDF

81.2 KB Created: 2021-09-16 20:14:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 7a8839e4a171eacb2476003a9d7dd6be SHA-1: e855a5036a26b7cba7604043ec26d704c61780f8 SHA-256: 0a493737d75e13fd672baa96b3fd62c756c06fd7bd1695dcb08c343947e6e1c4
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to compromised websites, suggesting a phishing or malware distribution scheme. The PDF structure and the nature of the URLs indicate it is likely used as a lure to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://laborke.ru/uplcv?utm_term=drag+racing+hack PDF link annotation
    • http://caythuocdangian.net/images/files/napezutigefosif.pdfIn PDF document text
    • http://ogledalata.bg/uploads/pages/files/40758842696.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c00ec96cad---lemanelewuvipeseno.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/99598bf6faa15d2fdb68ffeea6ce25d2/pezibizewasikorapumobob.pdfIn PDF document text
    • http://gewidor-gmbh.de/uploads/files/15483290576.pdfIn PDF document text
    • http://centromedicoveterinarioadda.com/userfiles/files/1141258259.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/file/misenozigotujujogux.pdfIn PDF document text
    • http://sharon-barron.com/userfiles/files/79770233527.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614265d1540fa---94529789951.pdfIn PDF document text
    • https://marbletreasures.com/uploads/image/files/xumofumojonenanor.pdfIn PDF document text
    • http://cdseoulps.com/uploadfile/fckeditor/file/71772627984.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/e3835b6e3a523b3cf9ebd796d78e05f4/kuwovibevamiwowubotuge.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/93603256170.pdfIn PDF document text
    • http://pnmanagementsolutions.in/uploads/5396940875.pdfIn PDF document text
    • http://pro-roubenky.cz/UserFiles/File/semupoga.pdfIn PDF document text
    • http://moneymaker-gold.de/files/xapunir.pdfIn PDF document text
    • http://lnimeina.it/userfiles/files/98589047267.pdfIn PDF document text
    • http://ladispensadicampagna.it/uploads/assets/file/52714427906.pdfIn PDF document text
    • https://medgal.pl/admin/ckfinder/userfiles/files/nejofozu.pdfIn PDF document text
    • https://bushregenerators.info/userfiles/files/koxiwobubup.pdfIn PDF document text
    • http://technestudio.eu/userfiles/files/papeb.pdfIn PDF document text
    • https://luathoanghuy.com/uploads/files/vonag.pdfIn PDF document text
    • https://hargagila.com/uploads/image/files/53487004330.pdfIn PDF document text
    • https://laughteronlineuniversity.com/images/upload/files/monixadubipirilogomap.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_off0000d986.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD986 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f198.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF198 18428 bytes
SHA-256: 22923b7029a7296b2c5090604556528aea5d074299a35717cf5a5c83b2ab6c8c
font_02_sfnt_off00012147.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12147 10036 bytes
SHA-256: ca15f8fa9d570e1ee009f31aa12f6c6c82d179b5dfa38bcd5a02202b6c0432c1