Malicious PDF — malware analysis report

Static analysis result for SHA-256 d505498477648272…

MALICIOUS

PDF

83.3 KB Created: 2021-06-30 05:44:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d6a3e48d3c968917a0c2d13868abe92d SHA-1: 64dc3b61559a6aa3dc33eb5093fce25230c6dfd3 SHA-256: d505498477648272ec0912f0706715fbddb197cd0042d09188fb4cf49de29b4f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs pointing to various websites, many of which appear to be hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://coretry.ru/uplcv?utm_term=8+c+to+f
    • http://asahiru-ban.com/files/files/baworajupapazave.pdf
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/39e82d338435dfb75884f5d333fe53ba/wigoginegowovinivid.pdf
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a3fd12531d2---93938076859.pdf
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160813f86c9dff---lifovuzagipapezopamabuka.pdf
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160722d1a3903a---sabaxesoneposarefidonuz.pdf
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d003a75408---jogimabanidife.pdf
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160970ee18498b---58577433842.pdf
    • https://dovolena-jiznicechy.cz/uploads/ruxina.pdf
    • http://stolizstekla.ru/userfiles/file/56542354525.pdf
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/15278901415.pdf
    • http://adamlegal.com/userfiles/file/79079828473.pdf
    • https://www.ideaklinikbursa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607df2d530688---xumevaxusa.pdf
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/6150058e1dd7063c27cd363da4f19ed0/56943611105.pdf
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a7d35010766---wotalazi.pdf
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/ae304f2ac2de3f3ab8b3d415ff46fc69/34610568990.pdf
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/tuuc039auj7999mg9d4eqsakf3/bepuxejesazamugovuvume.pdf
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c1e5f2b27bd---gizegoredorawono.pdf
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608f86d52243f---jevebugodizuj.pdf
    • http://koreanhotpot.com/uploads/files/58063314428.pdf
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/di5th5tovd02vd1ep5krtpf0q4/4039683067.pdf
    • http://aelma.com/sites/default/userfiles/file/31376644795.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_off0000e5b1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE5B1 16792 bytes
font_01_sfnt_off0000fdc7.bin
97e6ba7bca8df156cc61629a456d06e2fd10f79b6c94ed4fa89c34ae6b9a9ea3
pdf-font-stream PDF embedded font (sfnt) at offset 0xFDC7 9636 bytes
font_02_sfnt_off000112c3.bin
ac9c10b5077cf66ef2fee1d77338fa806e3298bf88580c7da8316fd4c773b2c3
pdf-font-stream PDF embedded font (sfnt) at offset 0x112C3 17416 bytes