Malicious PDF — malware analysis report

Static analysis result for SHA-256 04a49756d873d1e5…

MALICIOUS

PDF

84.5 KB Created: 2021-10-06 08:16:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e1ae50c6457ab9d0cff030c3f71aa4b3 SHA-1: c6c0f4fa4ad7fd7e92e0e81703e185ad088f1dba SHA-256: 04a49756d873d1e5c15001f571a96387e13f75adc5f120955f6ef6bad065d307
156 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. ClamAV detected this file as 'Pdf.Phishing.Trojan', and ML classifiers also flagged it as malicious. The primary purpose appears to be directing users to external sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://inwebjor.ru/uplcv?utm_term=counter+curse+harry+potter
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614dbf6ebc1f2---suvijagevi.pdf
    • http://jan-fotografie.nl/upload/files/185922743.pdf
    • https://rivieresoceanie.com/ckfinder/userfiles/files/zijaxejinunezibiwofo.pdf
    • http://campbellelectronics.com/uploads/13944268112.pdf
    • http://dautuck.com/uploads/userfiles/file/69619114963.pdf
    • http://makrostal.pl/user_images/file/tarajemulasexakevakufa.pdf
    • http://autosoftware.company/autoresponders_images/files/kufomotas.pdf
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/13g7o3motcu51g30ui43hbc3it/74466614312.pdf
    • http://podlahyadvere.sk/editor_uploads/system/files/rewowane.pdf
    • http://xn----itbbfrdrdbd4bgy6gi.xn--p1ai/webroot/files/files/91470761085.pdf
    • http://hajnysport.cz/FCK_userfiles/file/temonenigogediwu.pdf
    • http://angelcabrera.com/FCKfiles/file/zaburusafudeni.pdf
    • https://corpusbg.com/files/fck/file/xoruxifosipevaf.pdf
    • http://tc-antey.ru/uploads/files/zegesa.pdf
    • https://arrayamed.com/userfiles/file/kutiro.pdf
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e48f1bb856---sijazefapenifojexe.pdf
    • http://daimarconstrucciones.com/images/admin/file/27678954470.pdf
    • http://netflor.pl/upload/File/kaxiso.pdf
    • https://griby.biz/ckfinder/userfiles/files/83833017836.pdf
    • http://www.cavice.fi/tiedostot/files/remevukawub.pdf
    • https://mytekas.com/UserFiles/file/95943675966.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_off0000e183.bin
b1b52fbd568b139a3002dd4cc61ca5b7e6f04221e1b15b9aa1c50cea81fe5596		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE183 19356 bytes
font_01_sfnt_off000113fe.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x113FE 16792 bytes
font_02_sfnt_off00012c15.bin
c30d80169ed93dacd37edeb9281d5036c497451498edf5fba0841d9d6374afdc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12C15 10576 bytes

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