Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3dfec24d0c3c4a7…

MALICIOUS

PDF

84.4 KB Created: 2021-07-25 09:03:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: baccf999770cf322300e4203d765221c SHA-1: 9e6292b68cf4eb8493c49c5c62d0448f76c0193c SHA-256: b3dfec24d0c3c4a758bddbb65f9fb4b9ac521aba69b7da98226913bcc1dae27d
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document exhibits characteristics of a phishing lure, employing a link farm strategy to direct users to potentially malicious files hosted on compromised websites. The presence of multiple URLs pointing to compromised CMS uploads and disposable hosting, combined with ClamAV detection as 'Pdf.Phishing.Trojan', strongly suggests a malicious intent. Although no scripts were directly extracted, the PDF structure and embedded URLs are indicative of an attempt to trick users into downloading malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 8

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://usaoxin.com/userfiles/2021-6/file/mubigexe.pdf In PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607582b1bfba5---suvoxorujunidalenefa.pdfIn PDF document text
    • https://foundryindia.org/userfiles/file/19592717465.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/cbe1fedaf972ce715da4398836aa597f/24773774184.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1609b4ad97e0de---dosurisozosepi.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606faa9dcb92c---firukosavaxugolexaworize.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/773bca14qu9aotd2hs6rk653d7/3917168212.pdfIn PDF document text
    • https://retrofitoman.com/ckfinder/userfiles/files/46661361735.pdfIn PDF document text
    • http://brickform.cz/obrazky/files/93667285050.pdfIn PDF document text
    • https://bravo-hk.com/userfiles/file/76544635455.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5e6478f6be---jenoj.pdfIn PDF document text
    • http://www.biotanika.pl/upload/file/roxidotatitevivanipufibe.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160f60938eb723---19472139620.pdfIn PDF document text
    • http://jhroseclassof77.com/clients/45984/File/zesepenerojawi.pdfIn PDF document text
    • http://creaorganization.com/depo/sayfaresim/file/lidapome.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16088e27ac85eb---goxifivepomevetewabisopiw.pdfIn PDF document text
    • https://lapalettedesarts.fr/gestion/file/94508779013.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/160803c28e14ae---22975053250.pdfIn PDF document text
    • https://voyagerf.ru/wp-content/plugins/super-forms/uploads/php/files/ccc78da2192ece29c244828cab0fe1b4/dojewefato.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/25d30cb0d75dfbcb629217775db2b315/63207583546.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607efafc7ff7c---20298661640.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/k4o3spfrjuggat4v67vds0bm94/64023632586.pdfIn PDF document text
    • http://rheinmotel.com/userfiles/file/wemexipavokewiruzerizagi.pdfIn PDF document text
    • https://samoinstitute.mn/uploads/assets/file/57151687567.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=yo+whatsapp+download+apk+latest+version+2018PDF 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_off0000e5c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fddb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDDB 11220 bytes
SHA-256: 5b3573d7983d6248d754045d8a20459b78b05f7093cb8efc6b8030ddb161489e
font_02_sfnt_off00011830.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11830 16744 bytes
SHA-256: bcc3f693b993d0056e19a18e7cfd14d518ab492189db8356d04c80d166d5e0bd

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