Malicious PDF — malware analysis report

Static analysis result for SHA-256 24b46213c47c7a40…

MALICIOUS

PDF

120.6 KB Created: 2021-08-12 23:07:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9efa1cb113e02634b6bfa78cb372cc51 SHA-1: 7935b9fe3e7bc0324a6b8f3e1d9e0ad6b69ed6d8 SHA-256: 24b46213c47c7a407932a4cd79e4e689a04a895ef0b15fbeb2ae9a31cb7868b4
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple distinct hosts, many of which appear to be compromised CMS upload directories. The ML classifier and ClamAV strongly indicate malicious intent, likely to lure users to download further malware. The primary attack pattern involves using a PDF as a deceptive lure to redirect users to malicious content hosted on compromised websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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 http://atek-ent.com/upload/file/kipasuxerokoleritopuf.pdf
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/0cc45b90bd135583378f823313655d2c/xetivixowepi.pdf
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/05da27eab905d8c3d6db9cab9e716013/56941967995.pdf
    • https://almoheetmanpower.com/public_html/userfiles/file/pojado.pdf
    • http://ruihuitax.com/files/file/61823577909.pdf
    • http://sequoia59.com/clients/867919/File/14746152338.pdf
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7b5d617e4a---2034587456.pdf
    • http://karmand24.ir/basefile/ehotel724ir/files/867957475.pdf
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/51593329907.pdf
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/16071c901d5700---83226550134.pdf
    • http://zlato-invest.cz/upload/files/72283104868.pdf
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160845fd0d5c55---97303772781.pdf
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/161055f5ba3145---fadugagerixaferovupub.pdf
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/8a5eb2eca823938190df0bb9207196d7/51862592077.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=dyson+animal+dc50+brush+not+spinning
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000157eb.bin
1c3b68a3e900337a77a8820d33eeb93bd63779d4d6734429f815c84aa710c71d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x157EB 11440 bytes
font_01_sfnt_off00017253.bin
a268b92b12994289d0fe89701a68accf657f96cd88352f9adb2df13c6b854c5b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17253 16704 bytes
font_02_sfnt_off000188f0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x188F0 16792 bytes
font_03_sfnt_off0001a102.bin
6fd0b26c892841e1bd109800b279c46c3249ee343a07f0f5056380cb7dbc87f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1A102 19524 bytes

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