Malicious PDF — malware analysis report

Static analysis result for SHA-256 105e35eed006eb7a…

MALICIOUS

PDF

84.0 KB Created: 2021-08-19 09:19:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6d89d755fec3c91dc69465f34af82829 SHA-1: 0cab6227f6df752d80eb0cc9dbb2c99ad843d87c SHA-256: 105e35eed006eb7ad9d9f7200a731aebbfc69f0d4241a6f7bdbd7a3704d30d05
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, many of which point to compromised WordPress sites acting as link farms. These link farms likely serve to obscure the ultimate destination, which could be a phishing page or a malware download site. No scripts were extracted, but the PDF structure and URL patterns suggest a phishing or redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/160aa4081399e3---xixarawuf.pdf
    • http://ndt-ultratech.com/files/51430244221.pdf
    • http://hvpeds.com/upload/contents/file/21484968873.pdf
    • http://progettogeometra.it/userfiles/files/wiginek.pdf
    • https://acrgruppe.de/userfiles/file/64368945301.pdf
    • http://solarexperten.ch/fckeditor/editor/images/file/dadigejuwewupavosikalawu.pdf
    • http://kibbkw.com/uploads/file/35731172994.pdf
    • http://ediljolli.com/userfiles/files/jejofilavumefijididovo.pdf
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c5ef8af772---81037739304.pdf
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/b93c09444c582ae9f115ca23f5d71034/33445070517.pdf
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bfedaa1e96e---51440073957.pdf
    • https://gobelsprofil.com/upload/files/91563593846.pdf
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160cc34be68178---8725699509.pdf
    • http://kingtonkatsu.com/uploads/files/89988629887.pdf
    • http://www.naraihillgolf.com/admin/userfiles/file/24404922242.pdf
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16091065b3a3bd---13445965145.pdf
    • http://loveforlungs.com/clients/a/a9/a9a80f3a93b7553e0860ec1960497db0/File/mewalunemalavopuk.pdf
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/1pd36vfl19bfl9ce57dc58gg82/2537225638.pdf
    • http://thaiboxes.com/piceditor/file/wopekuruzejab.pdf
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160982e2a76584---sagafususorupop.pdf
    • https://ferest.ro/imagini_ws/notagasijaxorutezaba.pdf
    • https://protradingindia.net/userfiles/file/sofupadalud.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=the+ransom+of+red+chief+comprehension+questions+and+answers
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e1cd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE1CD 16792 bytes
font_01_sfnt_off0000f9e4.bin
e8bcbe142a6ee00be8432aab23b3858106169886f4680f7abaacacaedb144131
pdf-font-stream PDF embedded font (sfnt) at offset 0xF9E4 11136 bytes
font_02_sfnt_off0001138b.bin
d2ce9d2bc09f1dec2dbb78045e74b989ee64f5fdb94418dd222f72e44d7023f4
pdf-font-stream PDF embedded font (sfnt) at offset 0x1138B 17016 bytes