Malicious PDF — malware analysis report

Static analysis result for SHA-256 c70bd22f6fc21d30…

MALICIOUS

PDF

87.8 KB Created: 2021-06-27 09:23:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 972c39089dbfc4ebdd5a6be9fd9937e3 SHA-1: ab6f2ed2367cd3238814690da6515578a1f13d8a SHA-256: c70bd22f6fc21d305710e3ca821f8a5f4b584d83ffbe6f9436a99fdb0ba5ce6f
156 Risk Score

Malware Insights

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

The PDF file contains numerous links to external resources, many of which point to compromised WordPress sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to lure users to download further malware or engage in phishing activities. The presence of multiple links on disposable hosting and compromised CMS uploads suggests a coordinated effort to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/15bf0cad79e504ce3c5952bd26016f32/19829154817.pdf
    • http://hoondb.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079ba2b05362---livotakupepokepox.pdf
    • https://anmoul.com/userfiles/file/jibelalu.pdf
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16089ae4922555---xakezubawinajumabinak.pdf
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/c192e1d3d8b04ce832a899c8ed175422/26724570047.pdf
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/0a334a1e6fe184ec507b52204dd85b77/diruvawejezobuk.pdf
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a43bfdcaa08---gogugoni.pdf
    • http://nail-free.com/ckfinder/userfiles/files/xuradegodojekawid.pdf
    • https://aprilboya.com/userfiles/file/mesojis.pdf
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aba2b67659d---66580693459.pdf
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/16077cca4253aa---mifawexuvod.pdf
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/160940220d7254---96431111432.pdf
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1f2f30aecc---vefigulimototakumelefoka.pdf
    • https://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/q41bhc8n1urhg3u3b7eqepfr41/50491904000.pdf
    • http://franzoesischebulldoggen.eu/userfiles/file/watawodokulo.pdf
    • http://51-lq.com/userfiles/file///wisunujagon.pdf
    • http://www.mustwalge.ee/data/content/files/70641550763.pdf
    • https://amitadevnani.com/userfiles/file/75278425638.pdf
    • http://ucinnovation.ru/admin/ckfinder/userfiles/files/63870583025.pdf
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608fc5fc33234---lodeb.pdf
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/58aca154eec93c74ea75d92c6889d7fb/90800875905.pdf
    • https://detmers-kontejner.hr/files/28200157341.pdf
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160c51b3f82f82---dadopivosonovarul.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=first+movie+of+avenger
    • 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_off0000f440.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF440 16792 bytes
font_01_sfnt_off00010c52.bin
97122dd95152bcb795a8b322866b91c429e58cc2f6a56d6d3fadf7911921d26b
pdf-font-stream PDF embedded font (sfnt) at offset 0x10C52 17660 bytes
font_02_sfnt_off00013a38.bin
281bfcad3bae5eb0c46de4d4f2ed25eb397619a30327d208d67b5feb645faf35
pdf-font-stream PDF embedded font (sfnt) at offset 0x13A38 10552 bytes