Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a3b68c34db78d81…

MALICIOUS

PDF

94.0 KB Created: 2021-09-17 23:00:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d125f1994c22b630b60653e53543a94d SHA-1: 742af5308d786bfb0aa6cba844e5f4ef2004ee99 SHA-256: 3a3b68c34db78d81b19b8408ca1aa591838a382dbad8d265f3eb90e058073a98
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised or disposable hosting, indicating a link farm designed to lead users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure and URL analysis point to a common tactic of using link farms within documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 http://nomayaku.com/userfiles/file/mitazarelanaduxogaw.pdf In PDF document text
    • http://elementsgogreen.com/userfiles/file/zazoga.pdfIn PDF document text
    • https://negaratoto.com/contents/files/gopezidejogofasana.pdfIn PDF document text
    • http://pk.mo/userfiles/file/67382281940.pdfIn PDF document text
    • https://designclarf.it/file/xasedidos.pdfIn PDF document text
    • http://ezclasssites.com/var/wwww/dev-ezclasssites-com/data/files/razetivixivimape.pdfIn PDF document text
    • http://hoaiduc.edu.vn/ckfinder/userfiles/files/tufider.pdfIn PDF document text
    • http://captaincook.hu/userfiles/file/7744645725.pdfIn PDF document text
    • http://slenderclub.cz/ckfinder/userfiles/files/roletowe.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb3db54d84---sewatu.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/2a61ecf83d14883cb04c023c2d390ec4/komenuxigazak.pdfIn PDF document text
    • http://teplo76.ru/uploads/file/punazib.pdfIn PDF document text
    • https://ovistar-dz.com/ckfinder/userfiles/files/77883871342.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/a1nm7e24299ffs27ht7apvt2tm/39817463469.pdfIn PDF document text
    • http://puginternational.com/ckfinder/userfiles/files/wilir.pdfIn PDF document text
    • https://toscanafantastica.com/userfiles/file/74907190300.pdfIn PDF document text
    • http://cadelupo.it/userfiles/files/70808105811.pdfIn PDF document text
    • http://www.companyforte.com/imagenes/editor/file/68151421611.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/161323c2b47441---19258641532.pdfIn PDF document text
    • http://verzorgingsindex.nl/images/uploads/54739759901.pdfIn PDF document text
    • http://universalestetic.com/userfiles/file/xevodebedu.pdfIn PDF document text
    • http://nceed.kr/pds/userfiles/files/zuvoxixu.pdfIn PDF document text
    • https://albizy.com/ckfinder/userfiles/files/tavarusaxuwutov.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/16130f76cdc475---welepukagugiremuravokeni.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=thus+spoke+zarathustra+hollingdale+pdfPDF 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_off000102f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102F6 10992 bytes
SHA-256: 2e15e69a61e69717ffa504c17efb1d63bb41358aef957fc1753d95495216d8ed
font_01_sfnt_off00011c45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C45 20892 bytes
SHA-256: 98079cb2963457568cac234c051f43a864d285c6f6894ac6fb862bb2bb3ff0ef
font_02_sfnt_off00015226.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15226 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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