Malicious PDF — malware analysis report

Static analysis result for SHA-256 94c127928e5eb6e4…

MALICIOUS

PDF

88.4 KB Created: 2021-06-26 06:25:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e88c03aad4e85acb83e54136ec7169a0 SHA-1: 9eaaf8390b66fc2adc5d53c52d5cb799f1030a40 SHA-256: 94c127928e5eb6e46ca743be5c7e89eeabb292aade0b3581b4c22abffc204f45
156 Risk Score

Malware Insights

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

The PDF contains a large number of links pointing to various websites, many of which are hosted on compromised CMS platforms. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The file's structure and numerous external links align with a link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://ipublicity.cz/data/file/finik.pdf
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd709721ee---57415871492.pdf
    • http://www.microsinusectomi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083048e3f357---13919096769.pdf
    • http://zulassungsservice4you.de/bilder/file/lorikiregojodoman.pdf
    • https://chemasan.lu/userfiles/files/28398126608.pdf
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072c821d2917---85995920172.pdf
    • http://www.heksan.com.pl/file/pimepexu.pdf
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/gd2e8jus508am3hfahrqsmotqm/27464842446.pdf
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/1609a1a63c9340---ferozigevax.pdf
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/3d73b253033878d6f9aaca783a86d561/zudumowezadidesare.pdf
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081f7e4439bb---83185651243.pdf
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/5qum1ktmmg2bvjgvpkmajevb1m/womapasos.pdf
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/6cd91cfbc028730ca0e330b540abce44/merixogewed.pdf
    • http://findmecakes.com/userfiles/files/81201350631.pdf
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/160adf0a2cdcda---nevavoledovulagejetujo.pdf
    • https://bursac.net/userfiles/file/benamadisamerokutew.pdf
    • http://fine-cottage.ru/userfiles/file/37339367661.pdf
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607a23d3be201---31081956279.pdf
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/js48b2dab8835e00rnkstushb3/6742189982.pdf
    • http://www.assignproject.com/wp-content/plugins/formcraft/file-upload/server/content/files/160813ab9422b3---joxafezonekunewegulamif.pdf
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f2dc9c62df---jagonakemuratugasewa.pdf
    • http://businessvaluationapp.com//fck_files/file/19823240477.pdf
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/3fb7accedcaf4c1c1493bf91f77d4415/47480070596.pdf
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/a5f79c7f8db1f6c29002283828f62e36/82856564005.pdf
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/df2c0c7acd9613f73953255a233475cd/mototodesuredepajodekemep.pdf
    • http://billedbutikken.dk/articlefiles/file/46182486343.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=aristotle+and+the+soul
    • 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_off0000f175.bin
b299767a640c9b669f38a8414b89167dbc34de288fbc7f2dfcf251736cd5ccc3
pdf-font-stream PDF embedded font (sfnt) at offset 0xF175 10424 bytes
font_01_sfnt_off00010902.bin
dc25f67d1b2bffd49937da315037101efef49ca905fe8a28921a07e25e2a659f
pdf-font-stream PDF embedded font (sfnt) at offset 0x10902 21068 bytes
font_02_sfnt_off00013c5b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13C5B 16792 bytes