Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd79ff3482ebb08f…

MALICIOUS

PDF

85.7 KB Created: 2021-09-07 09:43:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 6c5123a0e057862f05bec6bc384d7ca8 SHA-1: 286c2e092d8c8f078d2eb30b19bcb8afb2070415 SHA-256: cd79ff3482ebb08f6a3a7043f958af00b77fe7d4482c6ad321aa7209ac88cfc0
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier with high confidence. It contains numerous embedded URLs that point to compromised websites and link farms, suggesting an attempt to redirect users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for link aggregation, further supporting a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://pixomot.ru/uplcv?utm_term=battles+of+world+war+2+timeline+worksheet+answers PDF link annotation
    • https://rrr71.ru/upload_picture/12008261295.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/n790acteqkc21b9pjv7u0r0k25/siwolewusemew.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/9pf14qqr6aso385m78m9v0p5e5/98956197271.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/37586bc5baeb78d455fae1bc24c618f8/14263388055.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/04769f26c877b009a379f882dc1c4505/gotepokufozup.pdfIn PDF document text
    • https://eobliecky.sk/userfiles/file/zemajulimumorulejus.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/bc27d19d82ad7588805796d0920e7ea3/nafakavekejijo.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b0cb9f3932d---relotowavewe.pdfIn PDF document text
    • https://www.llgnjinc.com/wp-content/plugins/super-forms/uploads/php/files/96dcbae060ac85955a94aa0abf925893/49371474630.pdfIn PDF document text
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/2413280a4e4dfd152860d380af00f680/jonisej.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/0rpg5qfsk5gjdaqh1nm7gqussd/zedopudozokeb.pdfIn PDF document text
    • http://avonsteel.com/UserFiles/file/talizifuzimavuxo.pdfIn PDF document text
    • https://fertilizerproductionprocess.com/d/files/98664201186.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082f9a8b5850---nipokukutenenonelugurofu.pdfIn PDF document text
    • https://mb-classic-service.de/userfiles/file/sanalokumumaguwibe.pdfIn PDF document text
    • http://lg-palette.com/upload/files/zufabudevonuwerudotomunir.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608166f9e2d48---voruwegowadufowu.pdfIn PDF document text
    • http://bmcnx.com/userfiles/file/wusapis.pdfIn PDF document text
    • http://cinstech-inspect-survey.com/fckeditor_userfiles/file/livamuzexazu.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609716956024f---vafebizekopezizafad.pdfIn PDF document text
    • http://cochu.net/resimler/files/31349377637.pdfIn PDF document text
    • http://marketypik.pl/zdjecia/fck/file/25544158451.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/23f72faab15ff77429dcf27596cddc1f/94147196114.pdfIn PDF document text
    • http://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/160908c4385a42---12651049831.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160739ccbcb904---2303342407.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e8ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8EE 18072 bytes
SHA-256: eb7e43c64bd64cdbf36fef9817cfdad5e3e967b1cdda0e0e31243efa23302d98
font_01_sfnt_off000117b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117B6 10968 bytes
SHA-256: 0f69f1e7088dac96db149b0c7a3ea4911888c9b222508632e303b9d70abaa789
font_02_sfnt_off00013122.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13122 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.