Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3a37dd730287146…

MALICIOUS

PDF

79.1 KB Created: 2021-09-07 23:07:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: f40ff906da87bc1fec3e3e18d842fb49 SHA-1: a7adfaffb9369d9a68f23bb1394dfd3995bfde7b SHA-256: b3a37dd730287146e426d627d2042733c2a5576dfe18788a0217ee1c382dc06b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to external websites, many of which are hosted on compromised CMS uploads or disposable hosting, indicating a link farm for malicious redirection. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16075272696401---80553572010.pdf In PDF document text
    • http://innotec-industrie.be/userfiles/file/zukukonud.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607a956076964---wipomufubazojototi.pdfIn PDF document text
    • https://study-abroad-travel.com/ckfinder/userfiles/file/12189655519.pdfIn PDF document text
    • http://koszyczarek.pl/userfiles/file/95488869192.pdfIn PDF document text
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/cu8l6vn5kmsvrms34ie447fb3u/pozifipodo.pdfIn PDF document text
    • http://www.anaja-inter.org/public/file/38315431355.pdfIn PDF document text
    • http://cana.vn/uploads/userfiles/file/wosebu.pdfIn PDF document text
    • http://artospace.com/pics/file/51271344676.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc8c0b0019---xotosufuto.pdfIn PDF document text
    • http://biirbeh.mn/images/content/file/dobez.pdfIn PDF document text
    • https://suma.ca/upload/editor/file/80523916526.pdfIn PDF document text
    • http://madiagranitosilano.it/userfiles/files/batanopas.pdfIn PDF document text
    • https://camelcarpet.org/d/files/pazojitumavipiniwoxezub.pdfIn PDF document text
    • https://kuzeyilac.com/resimler/files/kuwubisopi.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/cpcf0uv1rpv508sv1c7r2231t7/sifureruxumaweledilax.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab5f7388a2e---73808991302.pdfIn PDF document text
    • http://dpsszczytno.pl/photo/file/sisosugevafalodabolefu.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c207689dc81---tesalutuvitoril.pdfIn PDF document text
    • http://zatexpress.com/upload/userfiles/files/zobina.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/hr2f8d8hm3jst2rk1v4duo3m10/vomokubojiborosibafi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=2012+toyota+sienna+owners+manual+pdfPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d0da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0DA 16788 bytes
SHA-256: a41982072c06797a27a816f5bf9f0f1128a987e6b45516fdf06310fbd0a3fd39
font_01_sfnt_off0000fc9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC9D 11156 bytes
SHA-256: d39d64b5b23a5e0acce0076f825bc832520bcd23bb624aac445ef05b636d5965
font_02_sfnt_off000116db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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