Malicious PDF — malware analysis report

Static analysis result for SHA-256 435744b7b6d44a7c…

MALICIOUS

PDF

104.0 KB Created: 2021-06-21 08:44:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 28b4358d4acca62b0eee1e9dcc9deac2 SHA-1: a2630b71ab1ff50139601dbfeaf87900e2da0d49 SHA-256: 435744b7b6d44a7cb1dd21ffc75da6bf624b905b7d97a38b8a1e15f6011f545b
154 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting a phishing or malware distribution scheme. The document body, though heavily corrupted, contains metadata related to 'wkhtmltopdf' and a title that appears to be a lure, reinforcing the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8843

Heuristics 5

  • 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
  • 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://aimara-bg.com/userfiles/file/palagolulegazoril.pdf In PDF document text
    • http://asremajazi.com/uploads/files/48653245414.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ea6a5a7a13---rijetepifawatadatorili.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609ebab70415a---99136011003.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/o6p64f53ckgf1s8n2k92drcsug/xujurera.pdfIn PDF document text
    • http://beautifulmoda.com/userfiles/files/gimapusuraxixarerodo.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a18a5eb90a2---3041390010.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/a4c7071e1f6cdd93c021b94b09b7a63d/vabirukenubeziwopadepijek.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/13e5736ae04bb3dd77ee6be923c958c7/67820329690.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c7847a0aa3---95946123184.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/16097993a47cee---44155080202.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/1m5efpqttoulgjo7n04r74vqid/dafopadovukutuxafixore.pdfIn PDF document text
    • https://magerp.org/upload/files/rexegelimonu.pdfIn PDF document text
    • http://topas.lt/userfiles/file/siwamotaz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=tensei+slime+light+novel+volume+12PDF link annotation
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010f5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F5D 28128 bytes
SHA-256: cc2c3efe0d2249d4e48d875dcd756ad89eb1d6473998ab97c66871fd6eee4826
font_01_sfnt_off0001683e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1683E 4868 bytes
SHA-256: 27b49d41df378bd4544263a8711d2568ac377c401cd0dd3ca6ea39a5deceb381
font_02_sfnt_off000178b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x178B5 12156 bytes
SHA-256: c839ee77217a1c27d9eeb306c6156beebb0d70b998dcaecaefb2c2cfec4930ba

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