Malicious PDF — malware analysis report

Static analysis result for SHA-256 f068bfc0f4138e67…

MALICIOUS

PDF

93.0 KB Created: 2021-07-08 20:58:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 76c889f52f74db4755dfad40e805eada SHA-1: fcd45c981cd52a06ac0586b90f5b0da0ff45070f SHA-256: f068bfc0f4138e67aca945c02f0093b5b76eb9820a1ad727cef36c506a645087
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple websites, many of which appear to be hosted on compromised WordPress installations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to these sites for phishing or further exploitation. No scripts were extracted, and the document body was unreadable, but the URL structure and heuristic firings 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 http://www.apsetedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eec7c7df22---duvenivazutokanisigolal.pdf
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c5735608f8---gejona.pdf
    • http://ampletrekking.com/userfiles/file/nevewukosodesep.pdf
    • https://elminhaj.org/userfiles/file/pedorenu.pdf
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/7qotqff3c3mvp9lnd2q6lv0vd3/11314327598.pdf
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cca47784f4f---dexugaso.pdf
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dec63a7c991---48527857316.pdf
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/528de5a0e1c572e5fb5eb8b47ce8359e/89465885690.pdf
    • https://thietbivesinhanhhuy.com/asset/files/62790768907.pdf
    • http://dollreunion2020.com/clients/4/43/4392dc7a9e9236654a628da0af121bbb/File/81214807436.pdf
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/4ae93fa61b2fe9bdd44aa7a82406d20b/pefiposulotowilesog.pdf
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a2ac0c43985---27127930635.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160a7134929715---43627802891.pdf
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160974a3934c56---zuxuzujezosixije.pdf
    • https://grand-forge.ru/wp-content/plugins/super-forms/uploads/php/files/72f56e35608a99883a0de0921af1fcc5/nawodabonexaka.pdf
    • https://miguktour.com/FileData/ckfinder/files/20210603_1766696E00EC4A5F.pdf
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/5kh4t1t1ksbn3en5djqqv72ql0/23837767424.pdf
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6d0379df86---vuzigolomiwusuzibu.pdf
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5l1o610untvp6os4hjv1bl8s23/97473616258.pdf
    • https://bladmedyczny24.pl/wp-content/plugins/super-forms/uploads/php/files/862979b72ab0f8622c9ec647168cb18d/mawijenisaviduzat.pdf
    • http://rosesrealtyhomes.com/userfiles/files/wokirokefokakiveta.pdf
    • http://mnogonomerov.ru/uploads/file/10074582809.pdf
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/0b3iobof01t914inrhhf7088f9/gudativazovitadadited.pdf
    • http://isgsrl.it/images/file/keniboloriwobonabubuvap.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=cats+like+siamese
    • 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_off00010a90.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A90 16792 bytes
font_01_sfnt_off000122a7.bin
5906b4fb6bcde89a50a24d84a3d5443b23b39ba7f2e191d44abe11a46f677ffc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x122A7 10068 bytes
font_02_sfnt_off00013911.bin
5971c54e09eba16ee7cb8d153031df54cdba7898a09926cc4c029e358fec1be7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13911 17868 bytes

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