Malicious PDF — malware analysis report

Static analysis result for SHA-256 80c9e92f8ad9920e…

MALICIOUS

PDF

90.1 KB Created: 2021-06-09 18:22:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 3a0a79bc17c10557d6854bf07484520d SHA-1: c5563178fd907ddd8ec4259dee99ae5d200773b5 SHA-256: 80c9e92f8ad9920e19f63fc8b99cf41fa2f693c2a61f4267c8b6d6a165b4a098
156 Risk Score

Malware Insights

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

This PDF is classified as malicious by ML and ClamAV, and exhibits characteristics of a link farm designed to redirect users to potentially compromised websites. The document body, though heavily obfuscated, suggests a lure related to downloading books, aligning with phishing or scam tactics. The presence of numerous external URIs, many hosted on compromised WordPress sites, indicates an attempt to distribute further malicious content or lead users to phishing pages.

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://inwebjor.ru/uplcv?utm_term=recombinant+dna+technology+books+pdf+free+download PDF link annotation
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160773edc8fa7b---53236008791.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a40c36ba4a5---1744630805.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160821a9bd87bb---robapoj.pdfIn PDF document text
    • https://pilotcenter.gr/wp-content/plugins/super-forms/uploads/php/files/47js37jooars7vkbkis4498d4v/jureme.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16071827d212bf---86055042217.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/e0e8d5f580174a4381f8f43f08e35f49/sazimojosabuwudopaxanijig.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/97738c308f31a6d9eebbee41dc2fab3e/podomirosezaw.pdfIn PDF document text
    • http://bsl-trans.ru/admin/ckfinder/userfiles/files/vofasamujemeralo.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/5b76b74a25876b9e93fbf2bd52d87e0f/subibusaj.pdfIn PDF document text
    • https://biomedchita.ru/imeg_master/file/28022225739.pdfIn PDF document text
    • https://kede.org/userfiles/file/36366727167.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/ea4fd9217b47851670952fd275771e90/muwunotozikowaba.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/ijt1dlgjdh2960sa2pg4kcigao/88760046329.pdfIn PDF document text
    • http://banlinhkienlaptop.com/userfiles/file/46346043449.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080784845591---67900176679.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/th0vcl4ta7rh482lh9jibkc1d9/mipajevusaweb.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074313129941---59543032180.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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_off00011512.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11512 5760 bytes
SHA-256: 5d875afd74a6226be8b3c31dfa8fdee22dfc98fd61e72aad43bc6be16a36a6f9
font_01_sfnt_off0001288c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1288C 10728 bytes
SHA-256: eae91802b00a610228e55539d46922f737f6ec05df25b2520dbd486a2ebc7d21
font_02_sfnt_off00014d26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D26 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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