Malicious PDF — malware analysis report

Static analysis result for SHA-256 7db192c0464b3689…

MALICIOUS

PDF

82.0 KB Created: 2021-09-12 07:08:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0f00003cb3404274dddef6e7ab8f2e62 SHA-1: ff4504ee4ffd0e5826ddd35849685e757d9ce471 SHA-256: 7db192c0464b3689e00d92887e8becaebcf1f15e458940073b74f02784b90173
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to compromised WordPress uploads and other disposable hosting sites. The embedded URLs, such as http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/161370c0991a2c---53263938349.pdf, are likely part of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://millersexpress.com/userfiles/file/71172026046.pdf In PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c0d2213593---25396397807.pdfIn PDF document text
    • http://rymwid-training.com/userfiles/file/lelifukemek.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/1omjd7ba90uo5hvbircofgh5co/57979281546.pdfIn PDF document text
    • http://miyagi.chi-kara.net/Upload/files/betolanalepikidanope.pdfIn PDF document text
    • http://suncitygroup.ir/basefile/suncitygroupir/files/vokukasekozapizaxulejunig.pdfIn PDF document text
    • https://pamukoglu.com/userfiles/file/guxurubitifexigimuf.pdfIn PDF document text
    • http://officinedesign.it/userfiles/files/banetuzutagilofekawi.pdfIn PDF document text
    • http://willowslakerhea.org/userimages/paxevomumavamebekuvotosi.pdfIn PDF document text
    • http://sualpturizm.com/userfiles/file/21078066072.pdfIn PDF document text
    • http://investin-khj.ir/ckfinder/userfiles/files/tatisaliwinewabapiki.pdfIn PDF document text
    • http://poketomecam.com/uploads/files/4764631945.pdfIn PDF document text
    • https://kaparatt.com/images/File/95281794176.pdfIn PDF document text
    • http://janaturismointegrato.com/uploads/file/88585484388.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/161370c0991a2c---53263938349.pdfIn PDF document text
    • https://www.bramfordgc.co.uk/ckfinder/userfiles/files/10817758505.pdfIn PDF document text
    • https://essuances.com/ckfinder/userfiles/files/remizadefafevujaxisowived.pdfIn PDF document text
    • https://tramtron.vn/uploads/files/files/sopewifajenabu.pdfIn PDF document text
    • https://rajaketiga.com/contents/files/19590940786.pdfIn PDF document text
    • http://celesteandtorsten.wedding/images/file/xepifawakiporir.pdfIn PDF document text
    • http://stefanourso.com/public/userfiles/file/kabup.pdfIn PDF document text
    • https://dbmotorbrokers.com/userfiles/file/nudozutobafu.pdfIn PDF document text
    • http://detskypohar.cz/upload/file/sukufe.pdfIn PDF document text
    • http://jessie.vn/images/ckeditor/files/dunodekufekuvugigutolal.pdfIn PDF document text
    • http://escritacontabilidade.net/fotos/news/file/lumegajatezaw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=android+podcast+recording+appPDF 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_off0000dd29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD29 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f540.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF540 10624 bytes
SHA-256: 0866cbc760ea5d6085be13957ec58e90f7382437e3f31bd37de488d20590870a
font_02_sfnt_off00010d80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D80 17152 bytes
SHA-256: 02264ffcb42ed3726bbda515743a22b3419b03163cc950880df1840fba118ecf

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