Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7697828342bf98b…

MALICIOUS

PDF

93.4 KB Created: 2021-06-09 20:51:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e1289c2452b703a1f7f5a6c9cf944030 SHA-1: 3d33acd9bb20da21fa3a2129f3bd59b3b2a3c36b SHA-256: c7697828342bf98b3df9c6e35a463a6872fd60e75112974877f5e760478a6309
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links to external websites, many hosted on compromised CMS uploads, suggesting a link farm designed to redirect users to malicious content or phishing pages. The document body is heavily obfuscated and appears to contain metadata rather than user-facing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://allytemp.ru/uplcv?utm_term=french+%25C3%25AAtre+conjugation
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/47de2ca7b6ed85fbb7932565020c60f1/4747837341.pdf
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608bdb6ca8dde---48361637948.pdf
    • https://aadhaarretail.com/administrator/imagetemp/file/bibutefazebenasegulovi.pdf
    • http://nowyhotelik.pl/userfiles/file/845916715.pdf
    • https://cualuoihoanmy.com/uploads/userfiles/file/90906806713.pdf
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d338ab5b22---73541596086.pdf
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608b289d5be19---gegixux.pdf
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/597262a39a588c11bed459271c901287/bikukedosi.pdf
    • http://kompletucetnictvi.cz/files/file/mepamo.pdf
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/q7sqbqu4u87e0g0t2thnch856s/bumusexovibesafurobesuwo.pdf
    • https://amd-export.com/site/upload/file/48309581387.pdf
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/de6d6bab8f99a280a4f3ce03c2dc9dee/21767935021.pdf
    • http://am-assets.com/aom/magnolia/userfiles/file/54390135522.pdf
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073479104488---41058671700.pdf
    • https://hyundaia.ru/userfiles/file/35633812508.pdf
    • http://goteneplast.se/files/images/file/2065727755.pdf
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/b22584832d560f7dcdc807f39d4ee04f/39479321545.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fc97.bin
707f044220626673030db1e929683b7e6be6df4515348478205ae719871ec17a
pdf-font-stream PDF embedded font (sfnt) at offset 0xFC97 3312 bytes
font_01_sfnt_off00010879.bin
53f4fdacf347afba3311505200f6a92fd082e3b2c42a63cd17f3e04a744fe385
pdf-font-stream PDF embedded font (sfnt) at offset 0x10879 5032 bytes
font_02_sfnt_off00011950.bin
a36eee06fef6ce219692c4ec918276ac99413e4fd1e3666e4031624f9289d620
pdf-font-stream PDF embedded font (sfnt) at offset 0x11950 1800 bytes
font_03_sfnt_off000121dd.bin
fc7ed9d4a06fa8aed12982cec2f99229311997a0ef451fc93b6f6b7d64cdd353
pdf-font-stream PDF embedded font (sfnt) at offset 0x121DD 13688 bytes
font_04_sfnt_off00014d6b.bin
0a4bee1e12774e5a583aeea4be2bea1aa9ac69123984d821e0da8f58d2155794
pdf-font-stream PDF embedded font (sfnt) at offset 0x14D6B 16964 bytes