Malicious PDF — malware analysis report

Static analysis result for SHA-256 e04872170fbf3ad5…

MALICIOUS

PDF

86.3 KB Created: 2021-06-25 12:44:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7e9cc9e6514a3cbab39303356bafffa2 SHA-1: 7d1a8601ee513fb1f6d3de0bf8765e82a1752b67 SHA-256: e04872170fbf3ad5b8a3f6e29832a9cdbb9f2fdaad8e776776025f18b3aa8587
156 Risk Score

Malware Insights

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

The PDF contains a large number of links pointing to various domains, many of which are associated with compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable, so the rationale is based on the URL heuristics and malware detection.

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 http://simonide.org/userfiles/file/kijajesofebaxo.pdf
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160874d828381e---momerezimo.pdf
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160944c938e4a4---marobeduduzid.pdf
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/frakrqj75d62f31hm3itso11a1/93991907041.pdf
    • https://airbays.com/userfiles/file/bisevoxejujeravira.pdf
    • https://west-holding.com/userfiles/file/malutikusu.pdf
    • https://www.varishastalari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608984f523e3b---51815164302.pdf
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7ff3c5ba55---47765362479.pdf
    • https://loyallcanada.ca/editor_files/file/kevopojoxevuguxipefovuj.pdf
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/b08a2379b77f3235782cfb039d3b7521/83217847976.pdf
    • http://studiotecnicodavico.eu/userfiles/files/47444509720.pdf
    • http://silverleafspa.ca/clients/10619/File/60196670086.pdf
    • https://hssipm.com/wp-content/plugins/super-forms/uploads/php/files/092ca1d19f91e0de0c4585dd8a7e5baa/87756459269.pdf
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/0f66038ee7d30519a0968e081b2cac04/18247429806.pdf
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/e1b4452e84d72f29a9a930b746375396/94091014079.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=bay+window+leaking+from+top
    • 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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000efc2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC2 16792 bytes
font_01_sfnt_off000107d4.bin
6bcfb18059f6e816da4338587fbf7b47a9c1ff718afe1ff9758b5acb2589bf91		 pdf-font-stream PDF embedded font (sfnt) at offset 0x107D4 16908 bytes
font_02_sfnt_off00013389.bin
08ffd4bfc6505236c399385307b9afd6b92ded78cccc35525fdb68a2e44247d9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13389 11016 bytes

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