Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7b2f3f0ad9da82c…

MALICIOUS

PDF

82.5 KB Created: 2021-09-01 15:58:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ea64e9c60a2e7c839bb9a74e04f967e0 SHA-1: 3bcad41b7848fa3d02ae3fbaf19b1ad3e086d276 SHA-256: d7b2f3f0ad9da82c647c4b983c52f9d63b01949833cf0e694cf99ff8289cf916
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The file is identified as malicious by ClamAV and an ML classifier, and contains numerous external URIs. Several heuristics indicate the PDF is a link farm hosted on potentially compromised or disposable domains, suggesting an attempt to redirect users to malicious content. No scripts were extracted, but the presence of external links points towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/b93596ec4679868222d97920d55b6774/roreputozadavolinitos.pdf In PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160723ef8c136d---tazozaz.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/b47b0f7ce82002102557cb9fd32c44d7/46972677494.pdfIn PDF document text
    • http://afslab.asia/upload/files/sapuwa.pdfIn PDF document text
    • https://deltarents.com/upload/ckfinder/files/kadavageguzufimeniwuz.pdfIn PDF document text
    • https://zzwgjx.com/d/files/dajepijejimadakejifemuvo.pdfIn PDF document text
    • http://hart-metale.pl/gimnazjum/userfiles/file/gononulu.pdfIn PDF document text
    • https://preprodpcb.com/userfiles/files/filoxijowoxibaredumimaxo.pdfIn PDF document text
    • http://esipro.be/userfiles/file/2999290316.pdfIn PDF document text
    • http://mvdeastudio.it/userfiles/files/kujugokuxidenorumibugevo.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607b34c69cb3c---89196265240.pdfIn PDF document text
    • http://babyindex.nl/images/uploads/jeponab.pdfIn PDF document text
    • http://verypool.cn/images/upload/File/78550129546.pdfIn PDF document text
    • http://macabrey-luthier.fr/data/Files/63035954187.pdfIn PDF document text
    • http://brno-skoleniridicu.cz/ckfinder/userfiles/files/99378621843.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086c51a3115c---witetiku.pdfIn PDF document text
    • http://rana-international.com/userfiles/files/popavojopidit.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b05f74dfe4c---71681985012.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098c3f409b5a---46075059875.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/26e72ceca33b0bafa5966df61a9db5c0/kared.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16126db3a9c2d3---jugezazef.pdfIn PDF document text
    • https://nhachoxebus.com/upload/fck/file/tizim.pdfIn PDF document text
    • http://ahdongjiu.com/upload_fck/file/2021-5-21/20210521213123509831.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=do+gingers+go+greyPDF 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_off0000dcef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCEF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f506.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF506 10092 bytes
SHA-256: bf02251ec2b7bc5799ec794d7fdfdb8807011ba324e9191728c7455fc14c4723
font_02_sfnt_off00010ba0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BA0 18072 bytes
SHA-256: 9969bf179f48c4396f0d72070adcb1a32f04e5ea67ff47e577ac6cf7358d5f06

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