Malicious PDF — malware analysis report

Static analysis result for SHA-256 835c3a2b1b10f2e7…

MALICIOUS

PDF

88.9 KB Created: 2021-09-04 05:08:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2a2ccd61cb611dbe796c620199b555b9 SHA-1: b2386ef9235dc77f536c0cd3eb608b1d6b791541 SHA-256: 835c3a2b1b10f2e75159086f05cb2be79e604873693fbc19c8228799f903f656
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 WordPress installations or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/033c53bb68359d13997653d301aec0fe/gexetikexaxovojuraxipis.pdf In PDF document text
    • https://biblioteka-koneck.pl/ckfinder/userfiles/files/wezoxuvekironenasasiv.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/a42dc360175b9ecfb7034b53091aa140/58444205245.pdfIn PDF document text
    • http://www.startbatteries.gr/ckeditor/ckfinder/userfiles/files/2094818055.pdfIn PDF document text
    • http://hajni.pl/userfiles/file/tigafivitago.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/0259dd23d78cbde4c4b0ee64d3f79f72/27835588817.pdfIn PDF document text
    • https://enkaotomatikkapi.com/depo/sayfaresim/file/gatej.pdfIn PDF document text
    • https://chmelo.hu/sites/default/files/file/69738741016.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d976fe99a37---27699499836.pdfIn PDF document text
    • https://armagedonspedycja.pl/files/file/xizuguxanif.pdfIn PDF document text
    • http://daonshop.com/files/fckeditor/file/63940696439.pdfIn PDF document text
    • https://swagath.co/new/ckfinder/userfiles/files/nisivonoriropeguwijumomi.pdfIn PDF document text
    • https://emmaushuis.org/pages/nelirunudobonezuji.pdfIn PDF document text
    • http://taihegas.com/filespath/files/20210825134356.pdfIn PDF document text
    • http://faisaltowel.com/survey/userfiles/files/7393154421.pdfIn PDF document text
    • http://perrymanreunion.com/clients/f/f8/f8644f0eb9578147d5589f75b8c3e300/File/foxomezuzilinig.pdfIn PDF document text
    • http://snailgame.ru/upload/files/20210725221901.pdfIn PDF document text
    • http://accronline.com/userfiles/file/lapiwunozajojerowevokij.pdfIn PDF document text
    • https://bosgo.mn/uploads/files/jolizimagegu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3d0142fe1b---wojuvesugosurepowibok.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/1611f2b34139db---92906465920.pdfIn PDF document text
    • https://transport-vehicules.fr/userfiles/file/81685143102.pdfIn PDF document text
    • http://talk200.com/admin/admin/uploadfiles/file/dezefoxikuvin.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cdd6779bdfc---fetepepenarivad.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/ls6g8a55j5l9pqq39tu2e0u2an/zulisuvonetenavumalewu.pdfIn PDF document text
    • http://exoticland.bg/upload/files/files/wilalesofalepak.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/80252348169.pdfIn PDF document text
    • http://isvpro.com/custom/files/kixunuduxokodatakox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=mil+std+498+download+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_off0000f764.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF764 17244 bytes
SHA-256: c568f75993260de7f171f586a4d127a8e66edceda9d9b55f036d5caf2e01665c
font_01_sfnt_off0001244b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1244B 10792 bytes
SHA-256: 1535d5f986d44e996f67f6839aa8d8fafcce81082eed7bed09e7548993bc0e21
font_02_sfnt_off00013d61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D61 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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