Malicious PDF — malware analysis report

Static analysis result for SHA-256 9005b425934ca4ba…

MALICIOUS

PDF

82.1 KB Created: 2021-06-25 15:12:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 788dc722abd1f1b96f1594c3b047c510 SHA-1: 83941e1561e0384540ca61dde9117f94e26d0421 SHA-256: 9005b425934ca4ba33ed4ed5eb7829c9825446f3d72a17ac873187c210fc5a20
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains numerous embedded URLs that form a link farm, likely intended to redirect users to phishing sites or download further malware. The presence of these links and the overall structure suggest a phishing or malware distribution campaign, potentially delivered via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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 https://nomylo.ru/uplcv?utm_term=let%27s+go+6+4th+edition+workbook+pdf+free+download
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc16cbc5bc---66598341384.pdf
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/j7ia0pra3jor05bt9rplm6n0h3/97048935740.pdf
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/k47t8v77n9m1hhr1cac5931jud/73145553151.pdf
    • https://salubrismd.com/wp-content/plugins/super-forms/uploads/php/files/6b0b20997d01b63ff6ff7694ead14e5e/93884757725.pdf
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087ffe27c3c8---36860530363.pdf
    • https://ambientltg.com/wp-content/plugins/super-forms/uploads/php/files/115f66d00928aa9ef4161222bbe6cad2/24239794766.pdf
    • http://clinicaveterinariasangiacomo.it/userfiles/files/79883397201.pdf
    • https://wkd-uk.com/wp-content/plugins/super-forms/uploads/php/files/911e47b33359fea19bd7a1a8d7ee19aa/26366327789.pdf
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/5547ba74bf7ff991a94e565b88ed182d/54442165379.pdf
    • http://sl1971.com/clients/5/51/517263f0417f9379c67e6eba0e0bdfe8/File/viworafajuvinoroxuvozofu.pdf
    • https://udruga-invalida.hr/files/biwusaremoxejaranuteb.pdf
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/d8050e9b2dd8243f6f1cc60cd3d3d7bf/71853885367.pdf
    • https://ms01bet.net/contents//files/gozepib.pdf
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/9b0d7faf91954a6f9b245eb584969061/bewufuzosurawariwinadig.pdf
    • https://activepymes.com/pub/file/mosujedelogeken.pdf
    • https://unicornproduction.gr/wp-content/plugins/super-forms/uploads/php/files/8bf7b5d9ac36e05506b7d89e6f1a9ff6/45162734612.pdf
    • 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_off0000ce45.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCE45 16792 bytes
font_01_sfnt_off0000e65c.bin
6e515a6f63d5c122da7d20c8fb5544c34d7c1e27758579b9aace1076aeae92d2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE65C 11332 bytes
font_02_sfnt_off000100b1.bin
a637eaaf98e734ca88f63ef7a36092750260e9b3db6da53905baaa6745c47fb6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x100B1 22340 bytes

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