Malicious PDF — malware analysis report

Static analysis result for SHA-256 98abed537e40aa1d…

MALICIOUS

PDF

101.0 KB Created: 2021-09-02 03:49:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 717885594de796dbc457d37b29e7bda0 SHA-1: 1724ba5dfa2ed703bbbe361fef40c9acab31e407 SHA-256: 98abed537e40aa1d970e3116a95a3c6fedc5d79952fc69e9b3374919e758cd31
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of external URIs and link farms suggests an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://laborke.ru/uplcv?utm_term=justice+and+constitutional+development PDF link annotation
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/c0c21pm7ci7vu2itk2jmtd005g/53630076848.pdfIn PDF document text
    • http://centroolosprato.it/userfiles/files/fesivarila.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/tuxuk.pdfIn PDF document text
    • http://timandlor.com/userfiles/file/96004889278.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acfbb1ee5e9---mixajodilijuv.pdfIn PDF document text
    • http://shiokuda1.com/contents/files/37261801765.pdfIn PDF document text
    • https://dialogueinpraxis.net/files/docs/gelato.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/ratisu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5a41fc4d88---wasigesa.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/16083e1d2c3704---15484754369.pdfIn PDF document text
    • http://therealmccoyfamilyreunion.com/clients/f/f9/f9ea119420dddc0cc5ac7622830b9f68/File/ketakovarabobubofi.pdfIn PDF document text
    • https://simplehome.ro/ckfinder/userfiles/files/vofubeforumomi.pdfIn PDF document text
    • http://vanxuantravel.com/upload/files/voboneneg.pdfIn PDF document text
    • http://camionespanamericana.com/userfiles/file/nirebojunugifidov.pdfIn PDF document text
    • http://poketomecam.com/uploads/files/bivujilu.pdfIn PDF document text
    • http://brezov-gaj.si/uporabnik/file/54891580969.pdfIn PDF document text
    • http://kripasec.com/userfiles/file/femuwugutinozepupuwipata.pdfIn PDF document text
    • http://weingut-suppan.at/files/56597463021.pdfIn PDF document text
    • https://iwnta.com/userfiles/file/85626877391.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/e1e7b4998e2ac26e492abbbd6edbd71c/40353566650.pdfIn PDF document text
    • https://rentcar888.com/uploads/files/202109011746483365.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_off0001234d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1234D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013b5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B5F 18516 bytes
SHA-256: cd164dd63e1f198cd8e58c79309d12511d65f0cf6837266fc59201c83b6527e7
font_02_sfnt_off00016b3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16B3B 10732 bytes
SHA-256: a57c2c9840d6f04afa1b7375dfdc45cc4c41a7a9118cc5aed336361506ebbcea