Malicious PDF — malware analysis report

Static analysis result for SHA-256 01c4c06a0433858a…

MALICIOUS

PDF

90.6 KB Created: 2021-07-03 06:25:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 6f23104f488fe4c6b9c5803d410c7a50 SHA-1: 87ff3de5849c0f9779f842bb6b4a1b242a603876 SHA-256: 01c4c06a0433858abe40e9ee554483552c15f9efd572f94b418d8a1cce896bca
156 Risk Score

Malware Insights

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

The 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 CMS uploads, suggesting a phishing or redirection attack. The PDF structure and embedded URLs are consistent with attempts to lure users to external, potentially malicious, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc542d110f---34541869138.pdf In PDF document text
    • http://modnyi-buket.ru/uploads/files/wixuk.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/jk1cr1m2arvegl2856h8j7hmp6/35514621334.pdfIn PDF document text
    • https://www.dartmusicfestival.co.uk/wp-content/plugins/super-forms/uploads/php/files/965238b4501f5745c173a4cfe00d36f2/23952712525.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/bdhv338ufnpprpgdkrr8set8l0/zelakupiwokoderub.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/86105860789.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf5fd53176---59898689026.pdfIn PDF document text
    • http://bethanybaptistcolumbus.org/clients/75549/File/wumododakizixi.pdfIn PDF document text
    • https://traonguoc.vn/wp-content/plugins/super-forms/uploads/php/files/do3uoe9j2bqbqn6l8045o62sds/34252443776.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/160aabe8724e88---gulipe.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/m6h3t99omd937da2lcl3itr6tq/junizogeruto.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088f84e6486b---48816127664.pdfIn PDF document text
    • https://o-dance.com/upload/files/8240032773.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081442768259---81393169769.pdfIn PDF document text
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/776b65dbc6f06c9ef9ab7e050cb56fa2/38908074833.pdfIn PDF document text
    • http://bjaimama.com/data/upload/2021/05/file/202105201900484457.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aafb2ea8782---mewinozuwa.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cea4844d62---dagurilemagutugajudawid.pdfIn PDF document text
    • https://picinterior.com/ckfinder/userfiles/files/16003987125.pdfIn PDF document text
    • http://lukasikgroup.pl/Image/files/fitusobujurizizut.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/302272b527f08ae1c72a87e4808bd174/veluxuposuvipozitusuno.pdfIn PDF document text
    • http://ats-dz.com/userfiles/file/fetojomolifa.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d35cb8a3940---19757498675.pdfIn PDF document text
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/ac02d7127d580018200004e094c89315/fogivutiwom.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=world+expensive+number+platePDF 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_off0000fe69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE69 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001167b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1167B 17456 bytes
SHA-256: 8a62083edbe123cc9cda0e176eff0f217a7e5abb1a2b9b0da7f12a0a77c8d905
font_02_sfnt_off00014411.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14411 10952 bytes
SHA-256: 609e029f1018746f488afb233b877a4708cdd9f78135092e5b50464737836447

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