Malicious PDF — malware analysis report

Static analysis result for SHA-256 b244bb270d1accd7…

MALICIOUS

PDF

70.2 KB Created: 2021-09-07 09:55:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a265a76a3909c0f92ef34dbf10dd8269 SHA-1: 79d67ef5e7ddf280a81d2c8e99c53e84ae4184a8 SHA-256: b244bb270d1accd739a84951c50a0e7408bfd966cbe9a5df344fee7891bcf74f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to deceive users or manipulate search engine rankings. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the PDF structure and URL patterns are indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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://deforma.it/userfiles/files/wiwerupubulexepososaxaxi.pdf
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607b351e641dc---vejupifaj.pdf
    • http://coopmong.com/ckupload/files/liniluxot.pdf
    • http://mitsubishilongbien.vn/images/ckeditor/files/vomigudejubasalogivi.pdf
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/160e2e77ecf122---6783639844.pdf
    • http://ferramentabelleggia.it/public/file/35079718968.pdf
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608565fb48aec---gufurijaximoxemazutiseki.pdf
    • https://geneolock.com/locktactyuma/userfiles/file/66679316442.pdf
    • http://dochoiotovn.com/uploads/userfiles/file/12407434807.pdf
    • http://abbwingslynnhaven.com/uploads/files/berodipavipetivevuw.pdf
    • https://rmp-familienanzeigen.de/cms/files/51622124467.pdf
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/04aj4sas4nsgc4amhqalf7gd1h/75953210664.pdf
    • https://protum.se/file/fagubefetifolofazotovigu.pdf
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/qot8aqjo2g595t4686b92td56u/tuxodupanaporijugixega.pdf
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/16090f508bb087---92173964156.pdf
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/29c2943d38c6eebca99e36ac55d6dcd4/19445672014.pdf
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16085103cd0702---zawoseguxagilax.pdf
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160940fec62150---24950300580.pdf
    • https://chief-moving.com/editor_upload/file/83306632756.pdf
    • https://soudurelauziere.com/upload/editor/file/sezud.pdf
    • http://teplolux72.ru/upload/file/59587010595.pdf
    • http://richmediahouse.com/admin/uploads/file/lovupofuxaxosoxiburolim.pdf
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160fdac637a42b---51143400184.pdf
    • http://classicalgardenornaments.com/uplds/file/luxozoxitemejefem.pdf
    • https://partner-support.net/user_data/userfiles/files/64801424657.pdf
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/cada82120232457574a88197b7dcfd3b/vadawapa.pdf
    • http://ok-poland.com/userfiles/file/90794595592.pdf
    • http://3qlohas.com/CKEdit/upload/files/savozo.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=consonant+blends+passages+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_off0000b65c.bin
e4a65f453784a3d6b8ec3df3d7c03a2c46db591e77b0f103dada9caebcbb4616		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB65C 10652 bytes
font_01_sfnt_off0000ce7f.bin
64d8fd479800a0f93fa10e785cb5aff279452a8b762a269940de26979d1ac66e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCE7F 14560 bytes
font_02_sfnt_off0000f2c8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C8 16792 bytes

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