Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ecf2748d1754ca1…

MALICIOUS

PDF

125.5 KB Created: 2021-06-26 00:17:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d3259b26e5323570d6e6e43a5551f959 SHA-1: 3e6c21406024a0f5f7a5e818299d6ed01d6f7104 SHA-256: 7ecf2748d1754ca1ff90b75e8e1757115a992e13eec5361a7f5ef55e6074ad0e
156 Risk Score

Malware Insights

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

The PDF document contains numerous links pointing to compromised WordPress upload directories, 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 presence of multiple distinct hosts and the use of UTM parameters in one URL further support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://coretry.ru/uplcv?utm_term=histogram+with+percentages+r
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af89422ceaf---kuravegam.pdf
    • https://www.mii.net/wp-content/plugins/super-forms/uploads/php/files/e5e852b4ab8257ca6b0e3afd68f63c53/78096690013.pdf
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b42b60b643c---nijibivir.pdf
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be64d0a1502---gobetadiwejon.pdf
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/9cfd149f5d5802198b17acdacf3b091b/11875342905.pdf
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/1609c36ee4c9ac---lakiliratulodu.pdf
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/rv71p0qfaelu11e8gtbmfg0loq/37487611751.pdf
    • https://cursosgratuitosonline.es/wp-content/plugins/super-forms/uploads/php/files/85pcirsjr21t71rqv7rvm4h2eu/sefurokisugu.pdf
    • https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/cf4fa4db33723d6092064a0b8c3f7c19/17212715397.pdf
    • https://cald-lighting.com/wp-content/plugins/super-forms/uploads/php/files/a9958dd21d0057876461999f4992ef00/46133689644.pdf
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/4fdab43ee82b5816caa755a9dd0def26/38912046707.pdf
    • http://casinodanmarkjackpot.dk/userfiles/file/wazimoguxaluluvusexuzelu.pdf
    • http://adance0112.com/upfile/editor/file/mafululakaxiwiteri.pdf
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1608b75926117f---69473508203.pdf
    • http://teckim.it/themes/userfiles//files/51783687082.pdf
    • http://zge-led.com/luodan/images/userfiles/file/rezoxuduwikiwokil.pdf
    • https://www.herewardcarpets.co.uk/wp-content/plugins/super-forms/uploads/php/files/23eeru1vr1hfuscopndjrcgb3r/69950847238.pdf
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/d4660a8b7e069eec56907e08bc29c51c/joxabobaxogudo.pdf
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/rmjhgp3begpnjjj6fesljd07f7/nogep.pdf
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/01b7de3954d8f6b3438bda2678af7c60/97653365545.pdf
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/5d34d39c2af181e6eb30ab0f8fba27aa/jawejitusi.pdf
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/a96403c28653aa322b56a62f87322abe/26644072500.pdf
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/160721df7109c5---69047914799.pdf
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/44255517036.pdf
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c2e0cbe1f2f---40719934280.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_off000189b2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x189B2 16792 bytes
font_01_sfnt_off0001a1c9.bin
180a6b2d13919b0ec46ebf0b17097d41789514d651d39d99df7966a9971d801a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1A1C9 10852 bytes
font_02_sfnt_off0001baba.bin
628e27b4aa0ca7c94c20a19f99ade7595b962458d60deddc877cdbeff6cccf31		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1BABA 17476 bytes

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