Malicious PDF — malware analysis report

Static analysis result for SHA-256 0967fd573a6b69fd…

MALICIOUS

PDF

83.3 KB Created: 2021-09-17 20:23:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 19a1484b14137ab3281ea8f097af4e11 SHA-1: 23347a6b2a41fed52542815ea87cc19bae54bb30 SHA-256: 0967fd573a6b69fd5c2c0da6d70994ead9ac2e266ed24934d7ebb5d7708418f9
156 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs, many of which are hosted on compromised websites or disposable domains, indicating a link farm designed for SEO manipulation. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links. The document body is heavily obfuscated and appears to be non-readable content generated by wkhtmltopdf, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://smidgel.ru/uplcv?utm_term=view+private+instagram+photos+free
    • http://4998horo.gmmwireless.com/contents/files/gegesemejilamazewid.pdf
    • https://codecs.ro/images/file/lefexewe.pdf
    • http://eastcoastbiker.de/sites/default/files/file/woxunuxorifep.pdf
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135815558770---10291894546.pdf
    • https://bankubezpieczen.pl/userfiles/file/82565007630.pdf
    • http://unseretochter.com/images/file/88560287666.pdf
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/1613e8f2abaa74---mejinemewexomoti.pdf
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/4c9e2dd9bdb000888bb8238bca44868b/27113957012.pdf
    • http://shopphutungmayphat.com/upload/img/files/gidofomegefodamajevaziwi.pdf
    • http://polskienarty.pl/data/aktualnosci_imgs/file/59685448581.pdf
    • https://lionkingbali.com/uploads/file/23209061638.pdf
    • http://managhantasala.net/mailuserfiles/file/towutojaradisuj.pdf
    • http://chalappuram.com/userfiles/file/64009108494.pdf
    • http://msdoubrava.cz/foto/images/file/57444791176.pdf
    • http://pension-erlkoenig.de/img/editor/file/77701654586.pdf
    • http://krukaiart.com/userfiles/files/vadulekibinawakezipuzired.pdf
    • https://ita.kru.ac.th/ckfinder/userfiles/files/25697823074.pdf
    • http://tachikawa-derma.biz/ckfinder/userfiles/files/27835864570.pdf
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16143934bec33a---dujujaf.pdf
    • http://veoguidecostarica.com/ci/userfiles/files/93201453420.pdf
    • http://rfychina.com/upfiles/files/1631168448233.pdf
    • https://przygodanaukrainie.pl/admin/ckfinder/userfiles/files/tasabavupodiminebubef.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_off0000de5f.bin
3677e7352171a63a3ac1b3b188d075b94d3044bd0a351e6eda010193f1fda86e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDE5F 10880 bytes
font_01_sfnt_off0000f76e.bin
59849e9c079acf1e04999061c388581d4013339ef4d997659329e65db3f08a7f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF76E 18924 bytes
font_02_sfnt_off00012818.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12818 16792 bytes

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