Malicious PDF — malware analysis report

Static analysis result for SHA-256 31734501a01d65c3…

MALICIOUS

PDF

82.9 KB Created: 2021-09-09 13:00:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 2d9d7c73e3abd87062a6c71bf3488751 SHA-1: 48877b1908c597ce89f5cd676b97ab3592f31245 SHA-256: 31734501a01d65c3637f3b9e8b27e7ea68894ae7f6945418ccff5b94fa178135
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://myclubowners.travelenvogue.com/userfiles/files/32825000713.pdf In PDF document text
    • https://247christianity.org/fckeditor/userfiles/file/diraxixowuguj1631132215.pdfIn PDF document text
    • http://osayit.com/images/file/59440045721.pdfIn PDF document text
    • http://coming-c.com/userfiles/file/vuduta.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/de7cba6256ef72480c9740dacea7ae76/78230028600.pdfIn PDF document text
    • http://xn--3e0b556bhrbowi6undva.com/ckupload/files/21351804477.pdfIn PDF document text
    • http://salt17.com/userfiles/files/xupelowegopevarisefenuwen.pdfIn PDF document text
    • http://shanghaiqingchen.com/upload/files/sukibovafepojeme.pdfIn PDF document text
    • http://abwmountvernon.com/uploads/files/41235129240.pdfIn PDF document text
    • http://sbriz.ru/userfiles/file/dumijosuku.pdfIn PDF document text
    • http://thegioituigiay.net/uploads/files/ripigatewaje.pdfIn PDF document text
    • https://btegypt.com/file/57136986744.pdfIn PDF document text
    • http://cuacuonnhanh.vn/Images_upload/files/sekarotubanorum.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/161394162286bd---gebagaraminoguzefudusiji.pdfIn PDF document text
    • https://billard-hauri.ch/userfiles/file/burudijelu.pdfIn PDF document text
    • http://eachfun.com/ckfinder/userfiles/site_eachfun_com/files/zixogusudu.pdfIn PDF document text
    • http://ksiclubcom.ksiclub.org/svnprojects/DHD/Source/images/files/91465594653.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16137ca2343593---gozav.pdfIn PDF document text
    • https://onecre.com/images/content/files/nuwog.pdfIn PDF document text
    • http://mtreurope.com/ckfinder/userfiles/files/wuvijulepuvojuzuner.pdfIn PDF document text
    • https://alhasooncorp.com/Files/files/jiretadanumula.pdfIn PDF document text
    • http://4chan.ro/UserFiles/file/48372884576.pdfIn PDF document text
    • http://www.tsahimmongol.com/uploads/images/files/rugubofawudenulolixuxegax.pdfIn PDF document text
    • http://modaxch.com/userfiles/files/80281320108.pdfIn PDF document text
    • https://transport-vehicules.fr/userfiles/file/karaweneretovulojod.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=android+quick+stepPDF 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_off0000df69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF69 10620 bytes
SHA-256: 8edf54c0f6fb479f429b3cab7e0ed7a2df8d9f1280c6007b61c2a77bbfd7ded3
font_01_sfnt_off0000f7a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7A4 17880 bytes
SHA-256: c682cbb8978e103374f3020051584d0f1eba6e8b8db2c3a3f2b7d09b9a322731
font_02_sfnt_off000125d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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