Malicious PDF — malware analysis report

Static analysis result for SHA-256 01d427e72465d818…

MALICIOUS

PDF

69.8 KB Created: 2021-09-01 13:09:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 83ed641ccee8d1fa4cbb6ceea05fcd9d SHA-1: 086d5cffdd3009c30d998e4ce743707ed50d6ec5 SHA-256: 01d427e72465d818b8c61ded491b03edbec1c3c524f8c3e29b3efd4705af10a8
156 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which point to websites hosted on compromised or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and does not provide clear textual content, but the heuristic firings and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16088c18ae0594---59900499667.pdf In PDF document text
    • http://eros-arena-reutlingen.de/eros/userfiles/file/95327525703.pdfIn PDF document text
    • https://aterhesseg.com/up_image/file/57298843289.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/3tkvrrt52df8hps5v5s5scah79/ginorisekabibadaf.pdfIn PDF document text
    • https://laser123.com/geektic/files/roxogoselizibe.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/dedaf2f17a3280c4da09d7bdf3faca60/87133199909.pdfIn PDF document text
    • http://innovad-ltd.com/userfiles/file/1396325281.pdfIn PDF document text
    • http://sumisaedu.com/FileData/ckfinder/files/20210824_31D18360C5D5B293.pdfIn PDF document text
    • http://emotionpicturesfestival.gr/userfiles/file/50555372918.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/qup68qimpe4ueuvit4k7r33055/mepunesijebabobuleruki.pdfIn PDF document text
    • http://teknis.it/userfiles/files/xofotowojogaxalonetame.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b04371a5c5e---kiresida.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c6a5e5d3d86---71252639838.pdfIn PDF document text
    • https://jodhpurtravels.com/nbloom/fckuploads/file/fitodibusoludi.pdfIn PDF document text
    • http://inimtrento.it/userfiles/files/fubom.pdfIn PDF document text
    • http://zbraneklapka.cz/ckfinder/userfiles/files/42691182288.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1610fa1d468212---tekawajozalidatajowos.pdfIn PDF document text
    • http://pronobile.de/catalog/file/fowesulupinorekesuwivival.pdfIn PDF document text
    • https://soudurelauziere.com/upload/editor/file/gofisunevigokev.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160850e1b0357c---31393436461.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9abb2cbb4b---752246799.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a1e7e7697b1---82382807876.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611d9175c50b3---mofesuvojozawukopaduf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=is+it+hard+to+drive+manualPDF 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_off0000b47f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB47F 14756 bytes
SHA-256: c96dd37a4cd233a7d5d9403ccaee269e9ab1da7ee7ed411f8d353d24e7a8e959
font_01_sfnt_off0000d964.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD964 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f17b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF17B 10628 bytes
SHA-256: b4d0c3fe685ab70ac7083ccc89a8b441a0dd3b7c034d536a201e46a88b971710