Malicious PDF — malware analysis report

Static analysis result for SHA-256 afc0580e57151340…

MALICIOUS

PDF

78.1 KB Created: 2021-06-17 10:20:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 02bfb7923b2d9227f20835e8b702404b SHA-1: f97f9ee92ca47432875c7bd563034d8ca05aab0f SHA-256: afc0580e57151340d8144d8c7f4f64ad7a4bfe2cdf307ca9afb473847dee729d
156 Risk Score

Malware Insights

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

The PDF file contains numerous links to external websites, many of which are hosted on compromised WordPress sites using form plugins for file uploads. The document body, though heavily obfuscated, suggests a lure related to 'Metro cryptic crossword answers', indicating a potential phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to redirect users to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://garglob.ru/uplcv?utm_term=metro+cryptic+crossword+answers+uk+2020
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/16083b1cce1578---71564999869.pdf
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/52f3aa29158bc8f09cd9fa85fa43171d/wogex.pdf
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc42a51e62b---62033943279.pdf
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/5ck711aa31qj9lstsq05d9etcd/tanurapipikeno.pdf
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/9064a96cbd693d5667470c142e0146aa/vejewonekexaz.pdf
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/lv6lbu49ginlrca5dd0p8vb094/buvagofeduroraji.pdf
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/55f0ee2bf231a21b8678954c998a8a63/legitafi.pdf
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608939c35cb50---jufejazu.pdf
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16086f80b79889---weduzujoxe.pdf
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/16d5fbd573ed82c06a4588697c155fa3/33562415248.pdf
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082c75e862dd---fenelikebagipimigajuvut.pdf
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c038a921d65---gibezetolamivesitexumuf.pdf
    • http://fitnessklub-impuls.pl/uploads/assets/file/97690907829.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088be9f84fb7---80334644532.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e51c.bin
9dc67a9fa391263129a943580e2aef74f41a071edd08fc4306c024568c93742c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE51C 5572 bytes
font_01_sfnt_off0000f846.bin
5f41dd7de8ed64cc9d44bfe1ebb4e13f6f4c7d7a14ee73c397b13e8c2825698c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF846 4376 bytes
font_02_sfnt_off00010427.bin
6e3b4ac4c62e753011c58a17736dbde26a660be71b3470439581a91eb507f4f4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10427 11456 bytes

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