Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d6c40dd41915381…

MALICIOUS

PDF

86.4 KB Created: 2021-07-05 00:57:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e2cb6acd3a552ef75754d154e36a6c01 SHA-1: 0a0ece828899d21c075433fa906343ba013fbaad SHA-256: 9d6c40dd41915381092457a45bc33ea269ee9f1f503c466fdb5bdf3694d86472
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and is flagged as a link farm on disposable hosting, with several links pointing to compromised WordPress upload storage. ClamAV detected it as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The document body is unreadable, but the heuristics strongly suggest a phishing or malware distribution attempt via a link farm.

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://ketchas.ru/uplcv?utm_term=discount+alvin+ailey+tickets
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160719d1798eb3---bufuzixomuxamozezen.pdf
    • https://motacademy.it/file/86200192102.pdf
    • http://petrduchek.com/files/novazevi.pdf
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160747e5b99d97---2542730788.pdf
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/4e7db9960b4290038c34a77b24d32570/vazuzodafapotinisi.pdf
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6c6a73948e---32561546744.pdf
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/c633a6a5cbc38981e525c8f8b29d5004/9387910714.pdf
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/256if34lgi8nhsl09a1m3mt7be/ginuvixaxojuzuzilogu.pdf
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/4aovb5kh31guh6vlpi94hmopcq/58468677639.pdf
    • http://barksdalereunions.com/clients/869108/File/92540176550.pdf
    • http://ablerexthailand.com/userfiles/files/36688754962.pdf
    • https://binarbaidservices.com/public_html/userfiles/file/11769434998.pdf
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/431ef25c6259c0584de4bc570c803af7/nunesaxiwetozusorugubov.pdf
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d9901c8ecc7---95599148762.pdf
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ffff18366b---momibuvafotopufagizilak.pdf
    • http://resetimpianti.it/reset/public/file/43598558824.pdf
    • https://autopratichesas.it/file/zonubenojudajivutegiruf.pdf
    • http://barudan.hk/UploadFile/file/20210610155344709.pdf
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/35802ccf5798b7345ede0d3fcc17579f/21639058042.pdf
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/b7b6676dbaa87d507f4c8f9e3420e148/17204749990.pdf
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079916b68cde---vukuruderivakesupavi.pdf
    • http://hnc2.com/userfiles/file/30765948904.pdf
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/160792153141a0---27939671579.pdf
    • http://zelene-centrum.cz/webpagebuilder/ckfinder/userfiles/files/90014940217.pdf
    • 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_off0000ea53.bin
7e19c08eb2b2c0636bd857bd9ae795edcd55028897701a024c32b45eba8fd15c
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA53 18168 bytes
font_01_sfnt_off00011a78.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11A78 16792 bytes
font_02_sfnt_off0001328f.bin
f1748cffff737190f2d58975c4330508d83235f4b96007b35af6fc785a14b09f
pdf-font-stream PDF embedded font (sfnt) at offset 0x1328F 10496 bytes