Malicious PDF — malware analysis report

Static analysis result for SHA-256 be3d28d6b22bc343…

MALICIOUS

PDF

81.7 KB Created: 2021-07-01 14:51:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7dc99eeee03178616fe516c43f962387 SHA-1: 68ab3715abba6ae1d7a11c83992f82b62a0bffc7 SHA-256: be3d28d6b22bc343eaa1251de8d19f864b02333e0cdf06400078254a56a2b4f4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, containing numerous URLs that point to various websites. Some of these URLs are hosted on compromised CMS upload directories or on disposable hosting, indicating a likely attempt to distribute phishing content or malware. The presence of many distinct hosts and the use of 'utm_term' parameters suggest a broad distribution effort.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://fullcolorspandoeken.nl/userfiles/file/40335880577.pdf In PDF document text
    • http://deauville.ru/files/file/89606243062.pdfIn PDF document text
    • http://highendschmiede.de/highendfiles/file/dikufejarujubejerunutur.pdfIn PDF document text
    • https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/cd9728754a85fd689913ac259c56fb73/87311488712.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/e6db970d79f3b22db6051e39d9b976d9/21749407001.pdfIn PDF document text
    • http://bclgrouptt.com/userfiles/file/54516466836.pdfIn PDF document text
    • http://abogarestudio.com/userfiles/file/73430125167.pdfIn PDF document text
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/3f70d7f8db77baf770ae78f97c38010c/41044904202.pdfIn PDF document text
    • http://zetrade.cz/userfiles/file/81253838550.pdfIn PDF document text
    • https://2acontractor.it/images/file/fukekud.pdfIn PDF document text
    • https://108pizza.pl/uploads/userfiles/files/66720576866.pdfIn PDF document text
    • http://dfwarbitrator.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nixazixiguniwomoxi.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607e1921a6548---kofelamedagugilitunuv.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d8a9163ad1---xobirelexavafetuvupifukew.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/7446e6f48e5fe11f8b39bf65069c36be/sogewarivetugutupisi.pdfIn PDF document text
    • http://watsonwilliamsreunion.com/clients/82103/File/61872518388.pdfIn PDF document text
    • https://stmarys-perthamboy.com/upload/File/57477070416.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fbc6271617---13525090643.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce61831a752---bokofotumotebebozibelonen.pdfIn PDF document text
    • https://aviseco.ro/userfiles/file/45867514301.pdfIn PDF document text
    • https://sgotomotiv.org/upload/files/8360240108.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079a774e1b5b---82997668123.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acf26b524f6---lijesisevunonupi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=brangus+cattle+for+salePDF 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_off0000dcb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCB2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f4c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4C4 17076 bytes
SHA-256: a975181f1f709a7b4433e5b07c3b9c51404217fa7612c8ad71c954d1a39bdedd
font_02_sfnt_off00012168.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12168 10572 bytes
SHA-256: f950ea43d80457d1bb768e11bc0b94a2fe916bcb440b46f96efe91dcd095bd74

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