Malicious PDF — malware analysis report

Static analysis result for SHA-256 23d77aaf0b3885d2…

MALICIOUS

PDF

92.8 KB Created: 2021-07-16 13:17:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 083e22662bc3394c676b72e7783b877b SHA-1: c16aaecb975543ccf5c0bd36369e39cbf407b0b2 SHA-256: 23d77aaf0b3885d2f6b432f4cfb112da3917e3ffe7ade7c667facb96716230f7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites, suggesting it's part of a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the heuristic firings and URL analysis are sufficient to assess the attack pattern.

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 https://cructi.ru/uplcv?utm_term=practical+research+2+test+questions+and+answers+pdf
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1609d7641d712f---wawebumepikepowoliw.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e1a841a404c---xalidebovifalirixumexovu.pdf
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/28a245977338263c5275c7849ca08a76/64231923883.pdf
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6ab526a024---50351487924.pdf
    • http://colescastle.com/clients/875019/File/godaz.pdf
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/gl1msemsamiq030ku2gdfpnuta/fizumixune.pdf
    • https://stillwaiting.org/userfiles/file/tosikugoforuvud.pdf
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160badba6e77ff---25302445113.pdf
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b262274b077---viwurojojoxubumofati.pdf
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a5d65d95228---nilibavafipobegelala.pdf
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/c26701767077a8bce5d2e3856fb79a46/85063157640.pdf
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/7cbfar5f1vpn5ck4v1u8fc0ov3/29345575399.pdf
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2f31e5698b---tiravu.pdf
    • http://www.injamal.es/nueva/ckfinder/userfiles/files/81506360471.pdf
    • http://campbellelectronics.com/uploads/namukukodiwafuref.pdf
    • http://ruilong-ironwork.com/CKEdit/upload/files/61575235189.pdf
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/aea9b1968a2602a1afca8daa1cfcbce3/88753982458.pdf
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c011c1789e3---pigusagev.pdf
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160734e1fd13f6---pagowofedu.pdf
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/14d95db15ea4525924fc268a9babedf8/figufodazu.pdf
    • http://hytechplus.com/userfiles/file/wakapixusizoj.pdf
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/ugread0d7213lesg47n6b4o480/lirefox.pdf
    • https://yssnewlessons.org/UserFilesTwo/file/11532078419.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_off0001069c.bin
a9ede1a1439e922c697251501bdaba4e5f97113eae2291b7faa2cbb54c33ffd2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1069C 11168 bytes
font_01_sfnt_off0001208f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1208F 16792 bytes
font_02_sfnt_off000138a1.bin
dcfbc2931457dc8ac23d7ce919be7050bb9c9a2087ff8efac4958eec46483556		 pdf-font-stream PDF embedded font (sfnt) at offset 0x138A1 17200 bytes

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