Malicious PDF — malware analysis report

Static analysis result for SHA-256 a96c0124c0fa4115…

MALICIOUS

PDF

73.8 KB Created: 2021-06-26 03:28:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4ddb7de1601c3cb0d9c630188b74eeb4 SHA-1: dea71e6ebab9a35076caac13bd3dc3179ab2f33d SHA-256: a96c0124c0fa4115d6ace020aa990468edc57283dff1e07a3b56be6e6d31ebc6
156 Risk Score

Malware Insights

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

The PDF file contains numerous links pointing to compromised WordPress sites and other disposable hosting, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The embedded URLs and the nature of the links suggest an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://chcial.ru/uplcv?utm_term=player+one+get+ready
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/ce2n4gl2k2ri2e4ksr5vfnem90/wijuzax.pdf
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/3fba5f3c7dc489b6a6fb7638f3ec3242/fokelimo.pdf
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/02805b0e9b0fa332015cb469d0e00c51/jojusavif.pdf
    • http://mobydick-band.de/fckdata/file/86718682055.pdf
    • http://wonikqnc.com/upload/editor/file/1624374431.pdf
    • http://richfield1962.com/clients/4/47/47516dc9824f3897220912ef171c404f/File/mirokawapozev.pdf
    • http://automotiveenergy.cz/userfiles/file/mezawuzoj.pdf
    • https://aduanaldelvalle.com/userfiles/file/11042046901.pdf
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607c951012889---78633781536.pdf
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/1c93c889e057abdcce8164fa515c6205/bekopupu.pdf
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/mov9pu4a1mbi6dovigipara0c7/kakitinivib.pdf
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160737c389b46a---30956724517.pdf
    • http://banhangcongnghe.com/upload/FCK/file/23586438991.pdf
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/bh3q0156salf8j5hcj0dc27kqb/boduputedeka.pdf
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1214985b8b---lofolubasimos.pdf
    • http://hanhthien.net/uploads/file/37367862124.pdf
    • https://www.sixteengrams.com/wp-content/plugins/super-forms/uploads/php/files/1aqh9to4k17d25k4mnll7lgkak/19454990343.pdf
    • https://ooo-kenk.ru/userfiles/file/31699237189.pdf
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/9bc70effbb2025d3b1a9518d41d81745/78846937305.pdf
    • http://forspeed.cz/ckfinder/userfiles/files/rutamitis.pdf
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/16077fa0040e31---98382578708.pdf
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/erlgb3cnatukgku1nm2bb1fd19/konojavugi.pdf
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b11fd509531---nurejetiwevuxujusoso.pdf
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a6e644df8e7---203515271.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_off0000be7e.bin
b52452e38e485360e5367a38954581754742865012c639fdb4214b804ff3e86b
pdf-font-stream PDF embedded font (sfnt) at offset 0xBE7E 10276 bytes
font_01_sfnt_off0000d596.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD596 16792 bytes
font_02_sfnt_off0000eda8.bin
b833ea6e8c09538ccf1d0846e10b184ae18806573ca0879e786a0e47feaf4670
pdf-font-stream PDF embedded font (sfnt) at offset 0xEDA8 16668 bytes