Malicious PDF — malware analysis report

Static analysis result for SHA-256 94a1229d4fa2c47f…

MALICIOUS

PDF

89.2 KB Created: 2021-07-28 00:29:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4fe07e708e737f2b5e15c5e8dab83036 SHA-1: 53503f511a74cdf6a1e7af63d84a65c4ee7fcc45 SHA-256: 94a1229d4fa2c47f01d6bd5343af5379e9bd50fd585e21ec123876926bedd092
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and an ML classifier indicated a high probability of maliciousness. Analysis revealed the document functions as a link farm, with numerous URLs pointing to compromised WordPress sites. These links likely serve as lures for phishing attacks or to distribute further malware.

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://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fac7d264d91---65837705899.pdf
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/a1mjgu00bq8add00mqkajlv7u3/guwufal.pdf
    • http://netinflux.net/userfiles/file/dunizesuwonolus.pdf
    • https://austdoorcaocap.com/upload/files/22720780613.pdf
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/bpfahnkq5754bl512spqjuah04/17247152403.pdf
    • http://31kouqiang.com/userfiles/file/1624925949.pdf
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/daihjstqgme27tg6t02kbq8a3v/wezutalesikazotokewavu.pdf
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083322dd0317---81092736576.pdf
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/b05c3549f15f8845fb2a0eb1d1d542c3/dalolobu.pdf
    • http://kfbi.ru/content/file/legijepu.pdf
    • https://lightspec.ca/wp-content/plugins/super-forms/uploads/php/files/0b812c5bd25cfe7ef5d695d9c39bfb36/8853402642.pdf
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfd19b5a933---farikapaz.pdf
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/160916cde3b5a0---zanizivupifo.pdf
    • http://fotografiafrancescosomma.com/userfiles/files/48557590374.pdf
    • https://inverpalmas.site/aym_image/files/51896423285.pdf
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c94a4994ee3---85339351602.pdf
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16078764159d66---30026761665.pdf
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/a29eb57fd5539c903c125f2f5839ca39/sozarasuniwajete.pdf
    • http://htwy.com/upload/file/lopet.pdf
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba36828625a---fajegexenipadeduj.pdf
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081fea7b847d---nujuxonubosa.pdf
    • http://bigxra.com/uploadfile/file/2021062717042273499.pdf
    • https://aucordechasse.fr/vosImages/venototesasunik.pdf
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607a3096770e2---japidalu.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=what+ink+does+canon+mg2550+take
    • 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_off0000f8ab.bin
a6ec04bcda99603748c2910f2dc4fb04e563ed392e0791fcbd89919bd66f120b
pdf-font-stream PDF embedded font (sfnt) at offset 0xF8AB 17252 bytes
font_01_sfnt_off000125ce.bin
9eaca31016e41aec761d61d7a5bffe6fd904c7702b4fc7bab361cd1c338c1be4
pdf-font-stream PDF embedded font (sfnt) at offset 0x125CE 11132 bytes
font_02_sfnt_off00013f87.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13F87 16792 bytes