Malicious PDF — malware analysis report

Static analysis result for SHA-256 a46947d20ca64bab…

MALICIOUS

PDF

113.9 KB Created: 2021-09-01 12:56:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: bd7ef2b23343f935a3360a66ea4af8f3 SHA-1: f8464936b8e3a7bf5a0fbd5909ce1f0a425c0a0e SHA-256: a46947d20ca64bab6c122f841beb9fd7f2f5544f4a27dc1b5743e5c53d7c0ec0
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous links pointing to compromised WordPress upload directories, suggesting it's part of a link farm designed to redirect users to malicious sites. The presence of these links and the overall structure indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/62d35b085335a199fe61faf9be643d1b/29958306070.pdf In PDF document text
    • http://acecaalcoy.com/userfiles/file/96309811480.pdfIn PDF document text
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/a3bj2fcecnn16npk5s43s16c03/10042652198.pdfIn PDF document text
    • http://findusafranchise.com/files/files/gemotobakukoduwadi.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d82508ef41---betavakoxerisilo.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/51585a520ab956479c08a0ee510a62cd/vogunor.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/d88c06926aebb0c1eab3d20e550c4ebe/wolupekivi.pdfIn PDF document text
    • http://qytbearing.com/upfile/file/84975218996.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16094696773900---57731577450.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5039a4aa515950fa05e512649db767a0/tovofijobasagepuzujixipuw.pdfIn PDF document text
    • https://alsterparkett.de/wp-content/plugins/super-forms/uploads/php/files/jit80ii3timvd352j2shm84lg7/rigeregevawemopumezutemu.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607de7c7e5907---63183687419.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a1c13f41d66---tuvulebiradobugakumodetu.pdfIn PDF document text
    • https://rpdev.org/ckfinder/userfiles/files/xutipemesasitiseruselokax.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/ba836d3bd23b8afa7a1abb322fdedcd7/1266763687.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1611d3198c6ae9---bozojoxidexomodewiresaj.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16079dbd8e59da---zibewodomotetapegole.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/95171118948.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/707c24450529fb9f94c2031ac1afe356/kemuwaxafepudewamarufa.pdfIn PDF document text
    • http://fredericjean.net/oplusco/file/39438557032.pdfIn PDF document text
    • https://uangraja.com/contents//files/jekugatima.pdfIn PDF document text
    • http://stalmont.eu/userfiles/file/17952911701.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=factors+of+the+number+4PDF 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_off0001594b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1594B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00017162.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17162 10756 bytes
SHA-256: 8e97843570c33ba7c97cb7d1568475c299c9bfe69df4077040a9be22a7ba2fb5
font_02_sfnt_off000189ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x189FF 18568 bytes
SHA-256: bd7e51e13bd41a7af5d4c1b77857e9fa32bd5069238fed87c40d025d5f5ce98d

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