Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c3406c8ccce879c…

MALICIOUS

PDF

74.0 KB Created: 2021-07-04 05:43:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f32c284773338309b016280613458e72 SHA-1: fc304a47607b0a7b242412f48a6495e7c64462d9 SHA-256: 1c3406c8ccce879c03d173e53c578325c61ee75cb22f15032d8d0b028a0baabc
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to WordPress upload directories on various domains, suggesting a link farm designed to host or distribute further malicious content. ClamAV and ML classifiers identified this PDF as malicious, specifically as a phishing trojan. The presence of multiple unknown URLs and the heuristic 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' indicate a high likelihood of this document being part of a phishing or malware distribution chain.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/erfbkgbsev83dkvrgn6upv4mms/85264375321.pdf In PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a2a153014a2---vulesuxokefusowelivex.pdfIn PDF document text
    • https://aonetreks.com/uploads/file/6911398141.pdfIn PDF document text
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/ariv3plrrr32ihni4opb27nf02/84434753659.pdfIn PDF document text
    • https://mmagame.com/userfiles/file/43252221783.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dfa38c0f1e---69752146512.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/kegujamebosetigu.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/cf76035c3cec6fbf1e360e74fc544ca8/gowetotaximuzeriwonuta.pdfIn PDF document text
    • http://www.bluewhaleline.com/image/upload/File/pipimasulofipawadipat.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160806554ca566---4030779852.pdfIn PDF document text
    • https://fajanav.com/aym_image/files/dotomuvaje.pdfIn PDF document text
    • http://tanriovermensucat.com/uploads/genel/files/71563121189.pdfIn PDF document text
    • https://myveolife.com/wp-content/plugins/super-forms/uploads/php/files/359d9c368eacd90c07820e21c31a0506/nurotozok.pdfIn PDF document text
    • http://uni-farm.pl/ckfinder/userfiles/files/lubamabajuzazafitobipura.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160944d04846f7---61616183337.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/026066b34002f4ed57fd125293bed307/80835206026.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aaafd6bf540---29160779529.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609730ef3f648---dugapazemedawe.pdfIn PDF document text
    • https://ltgtrends.com/wp-content/plugins/super-forms/uploads/php/files/e2f131d592996ac8ef1a57d0f9b1f69f/99833240752.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/a69b40b7b49afc58c9ccf5471ae1bca3/fokubudanig.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=how+to+make+a+remix+of+a+song+for+freePDF 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_off0000bf99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF99 16372 bytes
SHA-256: 753322d7ea3a2a51cf32910b5029a2c9451934fec9a4b151cbdf0da863ae39c4
font_01_sfnt_off0000e9dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9DC 10780 bytes
SHA-256: 6ae72213a6c12f8417cb307a398a57182de8e2cf196540032b35b87172068e9f
font_02_sfnt_off000102bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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