Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1163c370e0a2a0a…

MALICIOUS

PDF

89.4 KB Created: 2021-06-10 16:18:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 4e29597a423c8133aca782298529cb27 SHA-1: 7a00904d7b90ce059ee660fbfd8a01bdda3e15aa SHA-256: f1163c370e0a2a0a1031e776f3e0afa478d4c37c6d46d9fc9e16910657be38e8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous external links, many pointing to compromised WordPress sites, suggesting it's part of a link farm designed to redirect users to malicious content. The document body, though heavily obfuscated, appears to be a lure related to 'biology book class 10 pdf'. No scripts were extracted, but the overall structure and URL patterns are indicative of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://cructi.ru/uplcv?utm_term=biology+book+class+10+pdf PDF link annotation
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160963098a3d31---28195593172.pdfIn PDF document text
    • https://samowar.ch/upload/file/24872977683.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ac3e3001384---xebupuwa.pdfIn PDF document text
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/9h1ed668ng3t86pkfvttnm8lvc/vabogope.pdfIn PDF document text
    • http://55thocscompany.com/clients/62662/File/sekokanusinenes.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/1608fa80589f8e---lipafunama.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/6661718214.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/n320oskt984t7kajdluho9rrgp/tujarono.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a178b0b5fe2---lotarijuxuj.pdfIn PDF document text
    • http://kovacsoltvaskerites.hu/images/file/31934690971.pdfIn PDF document text
    • http://eko-inwest.eu/upload/file/74656174134.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7847251a8c13ad16b7fc2ba0bccb945a/zavazijajexotik.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160aa4b4c7690e---bajad.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16085e7f909125---67156484095.pdfIn PDF document text
    • http://interel-rus.ru/test/sites/default/files/file/ruzasip.pdfIn PDF document text
    • http://sllight.ru/design/img/upload/file/3826822964.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/27059557166.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/ccf8ab8c65b9c5a7c95480e8f2b1b52a/22121016876.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/ca8b881e01d040ef49bb07c24d7ae703/68474981143.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001141b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1141B 5776 bytes
SHA-256: 004bbfb85231e6dcc05213fe8bcb686e7e66db06c3dd6724b0be0fce862735bf
font_01_sfnt_off000127f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127F2 10868 bytes
SHA-256: 486ef896f243f6abb7c5eba984e2e90eac7a43497e16a75eed64ac1469c4c1b4
font_02_sfnt_off00014d1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D1D 2704 bytes
SHA-256: 301b25a1c800571e564dd8343569d726410c81a3633851d420d08300fd17c00e

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