Malicious PDF — malware analysis report

Static analysis result for SHA-256 090ea413268263a3…

MALICIOUS

PDF

83.3 KB Created: 2021-09-01 08:14:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7c6791990941e9f53d83b5d4b348b1ce SHA-1: 32204b280634a07d8e2a29783bf44382b607c8e1 SHA-256: 090ea413268263a395613ea8a7ea8f6ea9894db74848c5b1dee3f7141df65a70
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to compromised WordPress sites and disposable domains, forming a link farm likely intended to redirect users to malicious content. The document body is heavily obfuscated and unreadable, suggesting it is not intended for direct user interaction but rather to facilitate the execution of malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://krisoc.ru/uplcv?utm_term=root+hair+of+plants+absorb+water+from+soil+through PDF link annotation
    • https://southernlightingsource.com/wp-content/plugins/super-forms/uploads/php/files/ff93f2e688bce7adced18ec64d8ed5f1/55456278742.pdfIn PDF document text
    • https://10fci.org/userfiles/file/42303696638.pdfIn PDF document text
    • http://hasomedia.com/userfiles/file/rigiwat.pdfIn PDF document text
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/18i3i8u816hosq1iscasghaeq1/zevivowusojutudelirupinez.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/c7fa1fcbc39cd45a39c96d2a067830ad/supop.pdfIn PDF document text
    • http://markone-tools.com/upload/files/69403923958.pdfIn PDF document text
    • http://stark-tools.ru/images/uploaded/pekava.pdfIn PDF document text
    • http://cn-biyoute.com/d/files/robajima.pdfIn PDF document text
    • http://acudrved.com/ckfinder/userfiles/files/jamudenusaguxuwez.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609f7d69087b8---15924479730.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff38cb9208---narev.pdfIn PDF document text
    • http://areawifi.com/DESARROLLO/userfiles/files/dowodub.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b2cec2c82e5---86402497606.pdfIn PDF document text
    • http://massiimo.com/piceditor/file/39934297348.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16072163a355ba---rupitudapomu.pdfIn PDF document text
    • http://arebiatours.com/uploads/files/32989868257.pdfIn PDF document text
    • https://driftwoodcc.com/userfiles/files/tepiguvifoviwurufebaza.pdfIn PDF document text
    • https://acronimocostanzo.com/userfiles/file/69640897629.pdfIn PDF document text
    • http://20thhelicoptersquadronreunion.com/clients/71358/File/94341538480.pdfIn PDF document text
    • http://yachtandgulet.com/userfiles/file/70767404102.pdfIn PDF document text
    • http://tofuyatogo.com/uploads/files/64538048483.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160755551780b1---91722473944.pdfIn 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://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_off0000dd9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD9C 17876 bytes
SHA-256: a6eda19059dc848859d70dae7865ce03ea3b56953910ae75e66e05725dd1a8d0
font_01_sfnt_off00010bac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BAC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000123c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123C3 11176 bytes
SHA-256: 9c7d04ddeb61180ad17740e93813c55efae2fd0932a1dc0e375ad1b6db0e28ba

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