Malicious PDF — malware analysis report

Static analysis result for SHA-256 1feb2c91fa3c6523…

MALICIOUS

PDF

90.4 KB Created: 2021-07-06 00:35:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 433f8b4ff1cd234ec01cb87a5ff2dd1c SHA-1: a4275e6deeea0a7a1e4770f15cafac8ecb7a7621 SHA-256: 1feb2c91fa3c65231b3b16d750e0a812db733cb68bb3a2196f4b337a3bd38668
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites. These links are likely used to distribute phishing content or further malware payloads to unsuspecting users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/03f7b5d486bebe7c3d50ae1d51b46631/45875353014.pdf
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/5kpshbb30lod12ngb8gmmbfq15/6131816121.pdf
    • http://shiraz.sk/ckfinder/userfiles/files/xolixeweworo.pdf
    • http://araonline.hu/uploads/file/4460165254.pdf
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/9c6cdacc58a8dde12342af5e9451c346/93965147447.pdf
    • http://abw10thstreetne.com/uploads/files/19892489716.pdf
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/781c1d5d39eaf00896807e2870411d2a/47219791474.pdf
    • http://strandedtattoo.net/file/95938602287.pdf
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8e6b68e23---gemizer.pdf
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082b5ab1b560---10714741181.pdf
    • https://bakwanudang.com/contents//files/nigamekorekuzevo.pdf
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607714cf54db8---1746914919.pdf
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b03b1b83612---litejikoreposegiviz.pdf
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/17ce9b5960e894d8032da33c963f51ac/64774076245.pdf
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/6a946b97ee150cc772321217437a8a3d/93514723294.pdf
    • http://diagnosticaedilizia.com/userfiles/files/9633803855.pdf
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/fcd09ac2cbaf826c76f4c9f0113d76ce/35446118653.pdf
    • https://vigiweb.cl/dinamicos/files/file/23649369816.pdf
    • http://bestbuyfromindia.com/userfiles/file/73314599322.pdf
    • http://fashioneducation.ru/userfiles/file/zekule.pdf
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/524651171e3ef7129df9eb17c9d2bbbf/97537182352.pdf
    • http://flexa.cz/docs/file/47637666423.pdf
    • https://protrialse.eu/files/files/93665554669.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=free+pinochle+double+deck
    • 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_off0000fe36.bin
132180da3ec84cab5b5b750d7afe33e3a3da7ad2e17846f57f3ad620ab66d1c6
pdf-font-stream PDF embedded font (sfnt) at offset 0xFE36 10492 bytes
font_01_sfnt_off00011597.bin
61c9861133ace908bb4b40213407640ee38495b4e77af68aa0de2b77b278fcf6
pdf-font-stream PDF embedded font (sfnt) at offset 0x11597 17772 bytes
font_02_sfnt_off0001448f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1448F 16792 bytes