Malicious PDF — malware analysis report

Static analysis result for SHA-256 92da899594fdd7b8…

MALICIOUS

PDF

84.4 KB Created: 2021-08-13 15:50:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: e51d9a8428923e23dbf1e4a080d27cfd SHA-1: 9bcb685bfe0d48299f81cf754125aec18f1c10ff SHA-256: 92da899594fdd7b8a949ab3ceaeec8de1d6296aacfeb9250f399c3d7acf8a390
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the structure and URL patterns are consistent with exploitation and redirection techniques.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/a68ce9681387f6591ad4f044820a1624/xijefupujonazanawavaj.pdf In PDF document text
    • https://ambient-interier.cz/files/files/37306934386.pdfIn PDF document text
    • http://opalsolar.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607b7131c2f7d---24327602828.pdfIn PDF document text
    • https://www.reachcast.ca/wp-content/plugins/super-forms/uploads/php/files/c15577b23aba4d09524e9213a61c8118/tugosevu.pdfIn PDF document text
    • http://agnieszkapawlik.com/userfiles/file/79279281165.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/eskjs4sa7j68ls4br0i0q6rt20/10831821126.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ab8eeaf0d14---vibigovinetopuxesekexow.pdfIn PDF document text
    • http://ewhamd.net/upFiles/ckeditor/files/watavoderawufuwuzi.pdfIn PDF document text
    • http://monkey-do.net/userfiles/file/bisifebotupa.pdfIn PDF document text
    • https://bibonatura.com/ckfinder/userfiles/files/15128565875.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/016ca8cfbe172e0609f7a9d4e0ef1187/tabadidetomojemoluv.pdfIn PDF document text
    • https://planet-for-events.de/userfiles/file/votitixetufowebujaget.pdfIn PDF document text
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/vk8l7h52b7oubfnduoeqeheqj1/86307839982.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/16088c67616a50---majaw.pdfIn PDF document text
    • https://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/c569nkqprqqka4n9fu4pq6a67s/6231717353.pdfIn PDF document text
    • http://kassa.pl/userfiles/file/21369558516.pdfIn PDF document text
    • http://tlxzkj.com/uploads/file/261954225049.pdfIn PDF document text
    • https://dbjadow.pl/attachments/file/96648644937.pdfIn PDF document text
    • http://vitalchurchesinstitute.com/files/file/68785450726.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089bbaccd58b---lojutuwe.pdfIn PDF document text
    • http://artkulinaria.pl/sites/default/files/file/bagerarufududofime.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ce22419af4---xidiponazoku.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=acento+diacritico+ejemplos+aunPDF 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e363.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE363 10888 bytes
SHA-256: bfc2d6863f829e51a9be150c08e4da2aab5c18d5c5842864c935c3b6a1cb469e
font_01_sfnt_off0000fc8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC8E 18440 bytes
SHA-256: 2fc0e64c0eedc21c1480f64d38dddc4bcf5dead0f75d92aef7c0771749365cbd
font_02_sfnt_off00012a75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A75 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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