Malicious PDF — malware analysis report

Static analysis result for SHA-256 53f64bc71942f425…

MALICIOUS

PDF

90.1 KB Created: 2021-07-03 14:54:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ed050d7d0d729c9f498131baebf08b29 SHA-1: 70a7b2ece3b3a275dbaa17926abebe31b5c19ad2 SHA-256: 53f64bc71942f425688de8925e15a62ab8eaff682342f138f6d7dfa40b9cee69
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to compromised WordPress upload storage and other disposable hosting sites. The primary purpose appears to be directing users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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://crysiq.ru/uplcv?utm_term=find+the+area+of+triangle+two+sides+of+which+are+18+cm+and+10+cm+and+the+perimeter+is+42
    • https://actor-conseil.com/files/file/dopowasad.pdf
    • https://dixietemporarystorage.com/wp-content/plugins/super-forms/uploads/php/files/0a59b850269ca0064a7cc5f43625cb7d/vowikiwigepil.pdf
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/160aabc849c3b5---86808902695.pdf
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/pcik0tfdf0fn1dppcurq1ilds4/ponen.pdf
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1609417f174aea---vorerer.pdf
    • https://maisonforville.be/documents/file/23103622348.pdf
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609df7711a4fc---gofoz.pdf
    • http://deltastal.ru/userfiles/file/sosivarixenitenul.pdf
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160972c1ab44b5---gagezikudupasubuk.pdf
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cadc8667887---xozuladanaxotiresigazazu.pdf
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/1rmf8to8aqidlvq42ta8jclhtg/95749653619.pdf
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607973e7a55d5---milakunavisugezepufit.pdf
    • https://tonitomov.com/picture/file/fojoxeraboparisisepo.pdf
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/6535407a4a8297134f2aab77421d83cb/73896111366.pdf
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609b75c13848b---xoxiwaguxej.pdf
    • http://staceyasp.com/UserFiles/file/vurogetekuz.pdf
    • http://acgroupenterprise.com/userfiles/file/fepimakipulasit.pdf
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/6oonjoungt1fns70an0436hd8u/dokutigegibawezoz.pdf
    • http://xboxheerlen.nl/userfiles/file/novewix.pdf
    • http://arch-teh.com/pic/userfile/wetifelaguvavivapenoto.pdf
    • https://bikeid.net/ckfinder/userfiles/files/96736527000.pdf
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a642b7f2af---jowajewuxeniwakijebom.pdf
    • http://www.melloecastro.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079f72dc437e---rejuzawulanojurapobu.pdf
    • http://portalcom-b2b.es/img/user///file/_0892962001620745673.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dfe5.bin
450eea5fc67953cc3bdc764260aa6f1739571c17331c9588074966c3dbef4c6c
pdf-font-stream PDF embedded font (sfnt) at offset 0xDFE5 16088 bytes
font_01_sfnt_off0000f51b.bin
f39ede8f73f09d5f4d6d1cb35ab73ee307052d843461e05157290ebb21806cf2
pdf-font-stream PDF embedded font (sfnt) at offset 0xF51B 11708 bytes
font_02_sfnt_off000110c7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x110C7 16792 bytes
font_03_sfnt_off000128d9.bin
f0aed9f84c55ff56c8bbd20b27db1a0f5364c34f6968863d1fe694cec06646cc
pdf-font-stream PDF embedded font (sfnt) at offset 0x128D9 18264 bytes