Malicious PDF — malware analysis report

Static analysis result for SHA-256 13baa09177c73205…

MALICIOUS

PDF

91.5 KB Created: 2021-07-01 15:17:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1c4e8e256ed497efb944a2eadd0e4638 SHA-1: a21ec7137131e8e019f4084af57025496a8e57b1 SHA-256: 13baa09177c73205431a1c2e35782e8c3cdbfba53cf0fba0b14a5032c917db89
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised CMS upload storage and disposable hosting, suggesting an attempt to distribute malicious content or phish users. Although no scripts were explicitly extracted, the nature of the links and the detection suggest it is designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/ef08edn4epc1rcpakh8sc6k9oi/95474084456.pdf
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/rjc912f5qnaeo578gntb5099oc/bexikaniladoninazosadife.pdf
    • http://fujavietnam.com/images/Download/88682995477.pdf
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a3b2eca2eb0---wazufexakufose.pdf
    • http://thecoferfamily.com/clients/7/78/7892d776c92a08c80f86ebc6236678d2/File/22551750996.pdf
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b54d7fe820c---32379387481.pdf
    • http://kalikraft.com/images/file/takubogirebojin.pdf
    • https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/a2b0897d50ac31cd1a1e44704f6571a6/71912261626.pdf
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/mv18tlj714kgnbqve621s3ca83/51449946251.pdf
    • http://robalton.es/Albums/images/file///pexikopexakofemofiwe.pdf
    • http://brnc85.com/clients/878796/File/64382233432.pdf
    • https://alarrabnews.com/images/content/content/file/nilivibiroruzimoridun.pdf
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/1609f24b917c37---zenejolov.pdf
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a579ad188f6---tipowuwavurexovo.pdf
    • http://reicar.dk/userfiles/file/81298246544.pdf
    • http://panziofabian.hu/fck_kepek/37689712716.pdf
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607b23f69231b---92419550956.pdf
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/16090b63cdaed0---ruvemurexawaxapo.pdf
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb3a7b1e734---13468515766.pdf
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7bae53a8f8---gavapusemepusowafaso.pdf
    • https://adepotcustom.com/UploadFiles/file/20210621131758193.pdf
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c963e7f051---48477986484.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=scientific+and+technical+translation+maeve+olohan
    • 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_off0000fe27.bin
d35a09596b7e4010395d16f74ee81660b60e043a6c8e786e93d7848582fda3ee
pdf-font-stream PDF embedded font (sfnt) at offset 0xFE27 19408 bytes
font_01_sfnt_off00012f25.bin
958111198c8b3a12e67ff93a09afad8e0b87a3677ecceb4801aec508eb1cf3ee
pdf-font-stream PDF embedded font (sfnt) at offset 0x12F25 10884 bytes
font_02_sfnt_off00014819.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14819 16792 bytes