Malicious PDF — malware analysis report

Static analysis result for SHA-256 5aa3495c1f9c7e5f…

MALICIOUS

PDF

98.7 KB Created: 2021-07-05 22:25:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 421f1edb36aecdd67e17902e9ece253e SHA-1: 0ca4dacce9247af816807f181a3663450c9f0676 SHA-256: 5aa3495c1f9c7e5f6bff37fad3c28b327b1a82b1bdbc115e05ed11aa5f3b3e8a
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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 http://theartofdesign.nl/ckfinder/userfiles/files/42991953399.pdf
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad24c7921fb---26365230638.pdf
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1861a5e2b3---69671322500.pdf
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b2c8aec773a---51571195281.pdf
    • http://wamer.org/userfiles/file/7949104152.pdf
    • http://boekenwinkelindex.nl/images/uploads/37020755151.pdf
    • https://implant-drill.com/userfiles/file/92939668304.pdf
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160856ac120483---98000636484.pdf
    • https://nutricionintravenosa.com/wp-content/plugins/super-forms/uploads/php/files/ad7a09017921da942d191c4dcb80e534/63722620983.pdf
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b2ef7b84d93---xisotopovatakew.pdf
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/053f2e314eaaf890336a1e48a011a0b6/lazodopopi.pdf
    • http://renknh.com/ckupload/files/83403051512.pdf
    • http://agama-rc.com/upload/files/67553769571.pdf
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/sejagudiduzurukeded.pdf
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd15126459---penazafomenelaxulado.pdf
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/cab73c351e82e05edd388164587565c5/topoxivisesuxakapotef.pdf
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160e2b4a70ed8f---48381856609.pdf
    • http://kimdaiphatsteel.com/Images_upload/files/13417774244.pdf
    • https://avenue102.com/uploads/file/59444483944.pdf
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/e1a4076dca6ba56206cfe76a1dcf0f2e/89440267845.pdf
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c2edf8791e5---50772483122.pdf
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/160d1e6924b87f---dozas.pdf
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609c9e502117d---tilivomoxobimewejumuzutuj.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afcbee57064---davugibatevezaronofami.pdf
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/d97b6034e92afd4901b97fe7163cb64b/gufoxililijivasisaju.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=200g+sour+cream+to+cups
    • 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_off00011f1b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11F1B 16792 bytes
font_01_sfnt_off00013732.bin
b1ac38367861d19fb5e10020588bed8986a4fc4cae89634daa4a2dcc0e5fc429
pdf-font-stream PDF embedded font (sfnt) at offset 0x13732 10720 bytes
font_02_sfnt_off00014fed.bin
cc5fb5a37f3879b8a1ada7f06d24a6297ebec5950ffd372eefb62f5268fbc720
pdf-font-stream PDF embedded font (sfnt) at offset 0x14FED 17548 bytes