Malicious PDF — malware analysis report

Static analysis result for SHA-256 307196805272ac7e…

MALICIOUS

PDF

94.9 KB Created: 2021-07-07 01:02:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: f3264766a97c7a6b2742b0ce11d91add SHA-1: 8aeb31b30fa3bb60ad4c0301811ca533e2536a51 SHA-256: 307196805272ac7ed3d5599f87c4d410f658fabf66c5868420987e0fea2542f2
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to compromised WordPress sites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL targets are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://drafthe.ru/uplcv?utm_term=chill+music+artists PDF link annotation
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094d52310812---88305569717.pdfIn PDF document text
    • https://humble-brag.com/wp-content/plugins/super-forms/uploads/php/files/uu1drc6bqp480q147co10aaqjv/62994574700.pdfIn PDF document text
    • http://xn--rssx31a7tec6p.com/upload/userfiles/files/20210626145113.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/f35aaef4c5c452c1e7849d7c3bd164c7/91192750539.pdfIn PDF document text
    • http://asianaccounting.com/admin/fckeditor/userfiles/file/29167188170.pdfIn PDF document text
    • https://ideylia.fr/uploads/file/51320672599.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16079047751d03---jaxupiwapamitu.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/a708aabfaaa2f3e5254929ebd4368e52/25783371082.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160beb5883bf62---89913399808.pdfIn PDF document text
    • http://byty-pardubice.eu/UserFiles/File/manoladotuwopesereti.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4384c4853---91144492916.pdfIn PDF document text
    • http://webatnet.de/ckfinder/userfiles/files/ferosewuvapofapal.pdfIn PDF document text
    • https://transport-vehicules.fr/userfiles/file/16482671316.pdfIn PDF document text
    • https://haysalon.com/public_html/userfiles/file/putoge.pdfIn PDF document text
    • https://mk-sito.it/uploads/file/21470158925.pdfIn PDF document text
    • https://sapporopools.com/contents//files/85288727302.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160aa5a6e31916---7693140340.pdfIn PDF document text
    • http://xn--dlek-5qa.com/admin/UserFiles/file/46793898558.pdfIn PDF document text
    • https://valserve.in/web/k/main_admin/ckfinder/userfiles/files/21504172858.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097bd01eaa5f---sogurevizisi.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160881a3c38b4a---lulubikisituxaj.pdfIn PDF document text
    • http://srihemkuntsahibfgp.org/hemkunt/userfiles/file/59009505678.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a28baa9519f---fukamagomokudigawi.pdfIn PDF document text
    • http://goteneplast.se/files/images/file/lamel.pdfIn PDF document text
    • 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_off00011178.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11178 17548 bytes
SHA-256: 29e1d941531818a867e118992ce12ef616c0ce484a3ac0838b3062f13ce3da26
font_01_sfnt_off00013f3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F3C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015753.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15753 10268 bytes
SHA-256: 404a4815d0ef5bb3942f1160f64e2162cefb54747a493404d3ca6d85aceeb576

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