Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6a5cfaabb9504b8…

MALICIOUS

PDF

92.0 KB Created: 2021-06-26 12:12:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: 78178c950b07546de854d45aa34f8d8f SHA-1: 40d516066bd07d152a5a7d0efa66736698a1b3f7 SHA-256: f6a5cfaabb9504b8ce3d7ced6c95ff39bfe174d8fcda6f8a4a0f9bd41656f27e
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains numerous links pointing to compromised websites and disposable hosting, suggesting a link farm or phishing lure. The presence of external URIs and links to compromised CMS uploads indicates an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://huntic.ru/uplcv?utm_term=renewable+and+non+renewable+fuels PDF link annotation
    • http://agnieszkapawlik.com/userfiles/file/wazujak.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4ba6a2d187---91567908363.pdfIn PDF document text
    • http://rocb-ap.org/file_media/file_image/file/detakotugixizitawozud.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/77a82a8e77ecb3b8dc43745bf7049c7e/gufakemadi.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160c557ec4c36e---xibotikilixam.pdfIn PDF document text
    • http://inarchengineering.it/userfiles/files/tovazepufajazamoz.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/1f62072e38606980532e9d795ba5e7e7/35575302639.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b4f90e125a---midotepimuxewosatibe.pdfIn PDF document text
    • https://burlingame.com/wysiwygfiles/file/jalifojanosejovo.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/40453433618.pdfIn PDF document text
    • http://alrabbancapital.com/file/files/togowagagofazalezurexi.pdfIn PDF document text
    • https://ekransamara.ru/files/xarekepofavawema.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/6b09c1600ddd5eacc8cbc8b5836cd032/69857310276.pdfIn PDF document text
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/1d1bac4a855d7c31d57ae677224fddda/nonujobasifipozagebubon.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/bf880086a24421fd00665898e9c8cad4/rimizemijimasowi.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16073b1cb8e7e7---50414216371.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160809d9bcecb0---16856938817.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/uni2fbitgsru9fgr0m2pp0ktqs/28258650712.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/d513001cb4e443301d371f0f1871e10c/84396423406.pdfIn PDF document text
    • http://extracam.es/app/webroot/arxius/file/68563590356.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/8329602068.pdfIn PDF document text
    • https://xaydungdonggia.com/app/webroot/files/images/pages/files/63999740628.pdfIn PDF document text
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071ebc5809c1---90968378823.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac18408cce3---fokowekuzuwipexunag.pdfIn PDF document text
    • 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_off000103df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103DF 10528 bytes
SHA-256: 4d14e0cfaba5297e491d46da64cfc85b075aa57fad1b67efd6668330fb3eb5e0
font_01_sfnt_off00011c09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C09 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001341b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1341B 17988 bytes
SHA-256: c2f425e614f6f8131832f30c4ba393d4416a441328dd27fec443c4206919cd79

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