Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b974af8a7a8c965…

MALICIOUS

PDF

72.7 KB Created: 2021-08-28 00:53:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 03b14cbda686433281149ffc5fd88e49 SHA-1: 884dd1f96a44a02bc9a34754f636e0fda6fadbc9 SHA-256: 2b974af8a7a8c965c4de9ae6b0ffbdf9cc5bc7e4cc89bed0a5a1762a37aa5c78
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous embedded URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to phishing or malware sites. The PDF structure itself does not contain readable content, but the heuristic firings strongly indicate a malicious intent to leverage external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://pistant.ru/uplcv?utm_term=how+many+pints+in+an+oz PDF link annotation
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/1d7c0c7fc78d14ea7260be215440f70d/33127355449.pdfIn PDF document text
    • http://shriramashramssschool.org/userfiles/file/faluvigezirikofaxanexot.pdfIn PDF document text
    • http://manisafar.com/basefile/marcosafarir/files/xegemowat.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6b419cdd2---89630219823.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609c6b8994fdf---sipudok.pdfIn PDF document text
    • http://ed-union05.ru/files/file/rukovu.pdfIn PDF document text
    • http://frezerovka.by/images/fxeditor/file/82823261587.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/782c321716abfceafb5330d527a0c54c/34233024496.pdfIn PDF document text
    • http://jakpaisanestate.com/images/upload/files/21158918562.pdfIn PDF document text
    • http://solarhomepage.ch/fckeditor/editor/images/file/kotijuxibakibebulalasodag.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f7a9cf438fe---zikigalikubizu.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611859628be47---36998884864.pdfIn PDF document text
    • http://phuongsen.com/img-chamthi/files/zidiguturonititoj.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607137ba8d7f6---guzapobixeni.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c79127b46e7---zasetav.pdfIn PDF document text
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/21a8709110d038a504364e66c4806809/kinujewa.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d972899b20---kekubujatomeva.pdfIn PDF document text
    • http://954move.com/clients/4890/File/vasotiluzowezuzesetewu.pdfIn PDF document text
    • http://vorne-sitzen.eu/pcms/content/file/zepojodexeruwunewuv.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160857ca206afc---78130563933.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/bed62bb314f7d70a5218cc23f5da29f9/sosowudogowuro.pdfIn PDF document text
    • http://indecomavo.pl/userimg/inc/bexaj.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611127b49b401---15029951524.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609c697fa3eaf---51775829222.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/161002bf2834f7---visexepivaremanisasaw.pdfIn PDF document text
    • http://flemingfamilies.org/clients/8/8a/8af36a28baf44bfc7b8a7004fb4eaede/File/32619414359.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_off0000bed7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBED7 10388 bytes
SHA-256: 1151e652406413fdcb68b00220f1cbab59ee624c72ea36127128a2a99e335a3a
font_01_sfnt_off0000d665.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD665 14980 bytes
SHA-256: b39a22d59e4b9f621bb8b5902a684d46a162161eab8df5373b1db7793a2e673c
font_02_sfnt_off0000fc22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC22 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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