Malicious PDF — malware analysis report

Static analysis result for SHA-256 103fe9b978b66058…

MALICIOUS

PDF

99.5 KB Created: 2021-06-25 21:42:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: da601b137afac3a1a5692e4eee41702e SHA-1: 32d7901f16d6f068c968416a0d2b8554c3bb35ba SHA-256: 103fe9b978b66058d78348e41d47e6c3cdc358e0053b8e6882059271946be824
156 Risk Score

Malware Insights

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

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

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/a14da70a20deb9c345d1f878df1dd543/witoxomapopokilemuva.pdf
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16079c433d77db---kuvonakekuf.pdf
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/855992113fcb2c10d535a338cf035bea/37075265819.pdf
    • http://knshzj.com/CKEdit/upload/files/rewebagifoxegaxofotava.pdf
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/40cqhc2k3j51i3c827o1qu86sm/98272708804.pdf
    • https://www.basur-tedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cec690f0ee---29989307397.pdf
    • http://aite-materials.com/upfiles/file/36735735436.pdf
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c74462a71d7---zopazorosuxabofiluxatug.pdf
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/99de21a0b8ed3430bd80086fd8289155/sebezakukilidagifizazidi.pdf
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/c78n4k9pm2bpuerl9tqormf1r5/3344386529.pdf
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/u1hbfebe2gfc4fghjt5a8qjf53/dasumeguvitokox.pdf
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/bad6cd3b66aab4d0e6a3e81165178065/ravodunufegowukoruvikuk.pdf
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1608e5607cdde6---53724615694.pdf
    • http://xn--49s538bo8ux8c.net/userfiles/file/35211014842.pdf
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/4013cfdb223b695aea0bf7f64562599e/foxuxiti.pdf
    • http://goldenbaycruisesagent.com/userfiles/file/15596157824.pdf
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/76d34a1a499ff662908ddc0fbe7ab031/maxim.pdf
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/dc2ae930131dbab45799e1c6d6622d41/74237513272.pdf
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/1coh582puhqgfuv29kc9mo6ni4/68208054223.pdf
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/8qghqnvvcuibbiabopgnv5ndgc/67181018241.pdf
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/b75029a0ecda8a1d5a09000e69e48ebc/58875629294.pdf
    • http://www.onlinetemsilci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f1467b659d---43013623350.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=diary+of+a+wimpy+kid+rodrick+rules+full+movie+free+download
    • 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_off00011f53.bin
cb858e34b737bd9babf9f6d8893f22c8d0c13723590b8caae1caac500f707f08		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11F53 17820 bytes
font_01_sfnt_off00014e0f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14E0F 16792 bytes
font_02_sfnt_off00016626.bin
4723d867067d87c60f26a0cc7262038e1c973810926372148f4a601c46942190		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16626 11140 bytes

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