Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee31ec1f8d42d7dc…

MALICIOUS

PDF

75.5 KB Created: 2021-09-01 06:50:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 328710190e19afa9d747cc1951f1deaa SHA-1: 36cfd66d171aac3fbf347e999e6aa1421b395f24 SHA-256: ee31ec1f8d42d7dcede735873b3441decab9cce4e7259df5ceaf394f407e8987
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious Link

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of these links and the overall structure indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://stitesattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/17207346124.pdf In PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e267aa4e111---82483918092.pdfIn PDF document text
    • https://journeywithmypet.com/ckfinder/userfiles/files/xanazoderezufizebenajez.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609ca15739ffd---saras.pdfIn PDF document text
    • http://baugeraeteverleih.de/benutzerdateien/26680607803.pdfIn PDF document text
    • https://www.antoniopopolizio.it/ckfinder/userfiles/files/30474632529.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/feitnvhfu27da1i820tjc8t7nl/rajala.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607921e18eca5---33259553945.pdfIn PDF document text
    • http://sns.hu/_user/file/menidew.pdfIn PDF document text
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/fa9b8c8377fa217733aebe14b5c9d7fd/luvokeguwina.pdfIn PDF document text
    • http://omegapizza.net/uploads/files/93522321004.pdfIn PDF document text
    • http://tinavaron.com/ckfinder/userfiles/files/24266686813.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad260843c54---pulevefozuposidataj.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e5b846b3f12---42435520369.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/1bd813356f5b6f4c9f4d562581e40614/pedikojorakujore.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/2fbf9c51226fe6d26687d037cb68e2ff/xenute.pdfIn PDF document text
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/91fc6230caf0b928796ffd335ee00161/defevinuvonatisajaxum.pdfIn PDF document text
    • https://computerzone.pk/file/29218011784.pdfIn PDF document text
    • http://espicycooking.com/files/file///30506228666.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e7b280bfbb0---98648679182.pdfIn PDF document text
    • http://studioambienteterritorio.it/userfiles/files/tomexodawu.pdfIn PDF document text
    • http://princeverma.in/uploads/files/mokivabedoratisifoz.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/68440311758.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/vamuvavazijodo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=predator+prey+lab+the+lynx+and+hare+answersPDF link annotation
    • 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_off0000c241.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC241 16532 bytes
SHA-256: d36033993198ef13c475f1667af9350fb5aa7f246bf4f49dd1cb596cea017a8f
font_01_sfnt_off0000ed0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED0C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010523.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10523 10840 bytes
SHA-256: 5d877b486026a31d60f95ce63f204106c3e711fca73d427a5715ca42bd0160b7