Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba253108812aa186…

MALICIOUS

PDF

115.1 KB Created: 2021-07-03 13:10:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 15b8bfcb244637117841caba2a495194 SHA-1: a911adcb055c094c4342ae02fe5811c24e0cc795 SHA-256: ba253108812aa186307cd44158c0769e3108f16e8bf17682800a9b568c4fa6b2
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised WordPress sites, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest a phishing or malware distribution intent. No scripts were extracted, but the structure and URL patterns are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://queure.ru/uplcv?utm_term=blue+nose+pitbull+and+lab+mix PDF link annotation
    • http://ubest.ru/images/file/63561216644.pdfIn PDF document text
    • http://bkbflooringusa.com/userfile/abbey/file/riliwuje.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160787d1d2d638---4914659304.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/2d31aa285b6bb8cb8245547769488ff8/zarajafifij.pdfIn PDF document text
    • http://reitinguok.lt/userfiles/file/fasokapetorefuwenup.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf8494dafd---gipujenolawexomebigeza.pdfIn PDF document text
    • https://ambient-interier.cz/files/files/nurijasila.pdfIn PDF document text
    • http://unsersohn.ch/images/file/2039192589.pdfIn PDF document text
    • https://ankaratemizlikcim.com/depo/sayfaresim/file/semupapadumojaped.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a62c5e9061a---masuzememomepizis.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085e83322dea---90008520343.pdfIn PDF document text
    • http://stevis.cz/files/file/98270765253.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/cb8940m60egnuvtp6nibkjoj21/wofojekamebi.pdfIn PDF document text
    • http://email-database.info/userfiles/file/76264180899.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bc4ca1da82d---xulojapaj.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ae63cc57cff---kebofonivofezetesogusuz.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609324d846f8c---woxikubikutemanobugobawi.pdfIn PDF document text
    • http://appletechsolutions.com/userfiles/file/28828498954.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c88c3ae760---xowumomakuw.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/160a08d4d9ad3b---bivadexebufenazibu.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/ebcf07fc3cc70152e9dbc102cc680f0d/46477391789.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/3e3b271a0957e609c10ef3ef2c348733/50005013837.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606da5d66b8f1---97614595633.pdfIn PDF document text
    • http://jkbprivateiti.com/userfiles/file/mukonakebefikotosogim.pdfIn PDF document text
    • 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_off00015d40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D40 18560 bytes
SHA-256: 547f183e7242e5e161a674a403261760bc7abdde33ab464be0f819e8cf737fa4
font_01_sfnt_off00018e18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18E18 10848 bytes
SHA-256: dd774797df462515ff342cd0afb34b745161409daa879137eb00b90e715ec2be
font_02_sfnt_off0001a6f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A6F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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