Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7f1e3f6c4c92d48…

MALICIOUS

PDF

86.2 KB Created: 2021-07-16 16:01:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7e85c79448250d4fa25b6d32b3957204 SHA-1: 0997d5022d38f31384c9cf4ca8ee3bf2e24c7754 SHA-256: a7f1e3f6c4c92d485ae632999ef36bc0976a943d12a23f6d645551c26ff6440e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to compromised CMS upload directories. While no scripts were explicitly extracted, the nature of PDF exploits often involves embedded JavaScript for malicious actions, hence the inclusion of T1059.007.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/rnujvs7475v0iuvdq9ju2h4joh/7242208076.pdf
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160925221a7aa0---mebufokode.pdf
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/d3697af5390644af85ae2bccaed72d69/nonoxuxuruvekexun.pdf
    • http://africa-emergence2019.com/userfiles/file/zalibofilajowo.pdf
    • https://akapacha.com/userfiles/file/sazaxafawenafosatomis.pdf
    • https://cornwallstaffagency.com/userfiles/file/65190716466.pdf
    • https://novahealthclinic.ca/userfiles/file/vumuvepu.pdf
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c16b40eccb5---zibiniluzomilibavom.pdf
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/0958c301401406e847eb17a127fcd986/72922909805.pdf
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/633e61f8f47d96fa8f54b6eb144b8c1e/sarabudok.pdf
    • https://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/ce53bcfbb9634565cb9a82502b1a48b6/mipusugulu.pdf
    • https://ukdirectremovals.com/wp-content/plugins/super-forms/uploads/php/files/ef47543947aff1cbe5c70a01c501ea40/29864125835.pdf
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/0710e397ff0b814c6aed79f8b265d789/mejijavubuzibo.pdf
    • https://investmentskillsgroup.com/images/userfiles/file/28716453459.pdf
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a1650f86e4a---56825137878.pdf
    • http://distributoram.com/files/file/81082882259.pdf
    • https://girilawfirm.com/content_files/files/zotasewetejiwuza.pdf
    • http://stroisvias.ru/userfiles/file/sejesibufol.pdf
    • http://healthywithhart.com/res/file/vimefedafugudomi.pdf
    • http://atel-j.nl/uploads/files/4575970010.pdf
    • http://bandenplaats.nl/cmsimages/file/derigopuwulifufaboxuwota.pdf
    • http://shinex-auto.com/userfiles/file/viwapesir.pdf
    • https://cowichanmusicfestival.com/userfiles/file/barumakimapolejisakigupiw.pdf
    • https://aawyx.com/sites/default/imageuser/file/putasokovojazuxuvew.pdf
    • https://communeouchamps.fr/userfiles/file/39834337749.pdf
    • http://fitsiluet.cz/data/file/sekazotibuxinin.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=nift+entrance+sample+papers+pdf
    • 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_off0000ed39.bin
7935d17e6c5a163b2057da597d0c40723840a58773b7e906f5951813cfc9c73c
pdf-font-stream PDF embedded font (sfnt) at offset 0xED39 10640 bytes
font_01_sfnt_off00010589.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10589 16792 bytes
font_02_sfnt_off00011d9b.bin
14e99059f0c56f0291cb19c73341f7145ea4033e55e69c1e0ab726b50381321b
pdf-font-stream PDF embedded font (sfnt) at offset 0x11D9B 17524 bytes