Malicious PDF — malware analysis report

Static analysis result for SHA-256 08b2017cc41ea152…

MALICIOUS

PDF

76.6 KB Created: 2021-09-01 15:28:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c22008100d78158ac3a5077cea3a70a8 SHA-1: 1f8af6cc7fe6189b3f44fc379daa63d56c2e97f1 SHA-256: 08b2017cc41ea1524b2b5c2787a4c7c939b329bb5c34973db47830668b264963
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, specifically within plugin upload directories. These links likely serve as a distribution point for further malicious content, such as phishing pages or malware. The ML classifier and ClamAV detection strongly indicate malicious intent, and the structure suggests a link farm designed to obscure the ultimate destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/16111db8b96ee1---pifalubupipadu.pdf In PDF document text
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/d3338db80ba38670f8f3a5d966effc43/wimizukufuwukutula.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/c2446c5c82074534c99782f264c0647b/86660395923.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b29bba5dd4---87283732301.pdfIn PDF document text
    • https://economiadecomunion.net/ckfinder/userfiles/files/rapigip.pdfIn PDF document text
    • http://heorungminhphat.com/luutru/files/zodozotow.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081192aae9ec---malinaratimovewuvo.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160b1397f19f5d---9986203462.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7a49d0f2c6---54897359502.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606e79ed6d7a8---kitegaxonatumakuloridapa.pdfIn PDF document text
    • http://aescantabria.es/upload/fckeditor/file///10988450637.pdfIn PDF document text
    • http://www.odnpoznan.pl/fotki/file/file/35918304561.pdfIn PDF document text
    • http://videofilm-tv.ru/content/File/wonevulebeliwajeb.pdfIn PDF document text
    • http://global-leasing-management.com/uf/file/33862463133.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/53957653511.pdfIn PDF document text
    • http://banghaija.com/userfiles/file/70678885836.pdfIn PDF document text
    • http://qianxish.com/ckfind_image/files/metobisev.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160fb9a76af112---94740558729.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b01cce61f6c---wegunexumemigejavurapo.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609b33b1a07dd---zatifut.pdfIn PDF document text
    • http://rococosofa.com/files/files/kalenezugulunixamovusi.pdfIn PDF document text
    • http://sgpeo.pl/users//file/mojugafepa.pdfIn PDF document text
    • http://chelseafoodmart.com/uploads/files/vijakikofefikuti.pdfIn PDF document text
    • http://frangarcia.eu/upload/file/46473936767.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=higher+education+sectorPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c96f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC96F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e186.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE186 10696 bytes
SHA-256: 697bbb54dc5e48fc0ebd81cafce5df01d0277fae7b413ce530e037e85506f093
font_02_sfnt_off0000f9c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9C4 16724 bytes
SHA-256: a9298877988654106a8dc166b78896936700ff190c440e6baf2bf867df90cc56

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