Malicious PDF — malware analysis report

Static analysis result for SHA-256 278b76a61ea60250…

MALICIOUS

PDF

78.5 KB Created: 2021-06-05 09:53:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 44a8b7d4a68265fd717116bce3bf4fd8 SHA-1: 42e4778d3555b3a8c1283afbd570779f6a8e2260 SHA-256: 278b76a61ea6025031ad4d7511bbbd608741673d4be0552dc4b59a0a01780cc8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for Pdf.Phishing.Trojan. The file contains numerous embedded URLs that point to compromised WordPress sites, suggesting it functions as a link farm. These links are likely intended to lure users to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://infrive.ru/uplcv?utm_term=intex+2650+gph+sand+filter+pump+%2526+saltwater+system+set
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5ab58c6d8d---nuzirilazonisibabed.pdf
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/47e36f794249d45114490c678ab099c5/3153426046.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608702e76bd31---tawabimi.pdf
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0993602f01---70343512294.pdf
    • https://dallaslandscapedesign.com/media/files/91750154321.pdf
    • https://asset-books.com/userfiles/file/32803281194.pdf
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/4b9aff3325a2024496bbd6c39107e9aa/45490048340.pdf
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/80620706630fe7ef56092bcdbc24d553/78560830104.pdf
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1a26beb94a---32329931324.pdf
    • https://astek-telem.fr/userfiles/file/50959538940.pdf
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/1607eeb7bbdc19---lodavetaxovitajezajulolan.pdf
    • https://tolgyesvolgy.hu/userfiles/file/19457802335.pdf
    • http://ersatzmonitor.de/userfiles/file/57528601732.pdf
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/c93515d614fb9b4ef0412af3ab80f037/vegamazorixejilar.pdf
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/160978a2243cd3---xotepoxavijovixoxeputoj.pdf
    • http://topas.lt/userfiles/file/79566317310.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • 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_off0000e2f9.bin
94c8440fef1d56e5847a758cfef690792fa72ec4225364f7bed4afa0a4e68fe8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE2F9 5784 bytes
font_01_sfnt_off0000f675.bin
e711e8e87826a5ee9c75e796a0832fbce7d2c3986026a32cb6663172f185b980		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF675 11736 bytes
font_02_sfnt_off00011e90.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11E90 4324 bytes

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