Malicious PDF — malware analysis report

Static analysis result for SHA-256 39770db854dc082c…

MALICIOUS

PDF

82.5 KB Created: 2021-06-29 00:12:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3b30bc04255b46aeebf144213004c7db SHA-1: 1b5ffba432e658df94103f076ecbd57fd4abaa81 SHA-256: 39770db854dc082c8ee433929e065053f727fc13385948b80e7901e85c358b65
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to compromised WordPress sites and disposable domains, indicating a link farm or SEO manipulation tactic. The ML classifier also flagged this PDF as malicious. While no scripts were directly extracted, the structure and URL findings strongly suggest a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 6

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/67ca92535756e8284746c770bcb767f3/44514256940.pdf
    • https://cardion.dk/gfx/fckimages/file/kulubojijadusizenol.pdf
    • http://aliglobshop.com/userfiles/file/gajexezutelarenibuvofise.pdf
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/f4b78ec9050d0c1cab9a81813eb9f2b8/9184709999.pdf
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/7afdc1d372993356e7633b55e13ccc16/57200159060.pdf
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/bvs37npt5v5mc3qgdqh66l3o67/nevujozazeneret.pdf
    • https://lucky-erotic-massage-bucharest.ro/ckfinder/userfiles/files/45293021780.pdf
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1609b2f9b85fc3---zibas.pdf
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/ts7vp1ohionhd7tc74mrdip5h5/27978825066.pdf
    • http://wrtour.com/FileData/ckfinder/files/20210531_3EEA2D93966A03B8.pdf
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160969e726f640---rabujikazib.pdf
    • http://thaoduocquyhiem.com/userfiles/image/file/37963084075.pdf
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607d249a72c4f---78858986664.pdf
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160863a987906e---20233131351.pdf
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/nnh8ogs9giccs76ujjvq7v56d0/32607973687.pdf
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/031aca20c2b21ad20917632e559ff48d/78307237787.pdf
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b12f4f758a7---simowapakezozubos.pdf
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607f74e615add---latamojopusijaxejipujerab.pdf
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160aa2345b1788---gorirusupidumojora.pdf
    • http://lacasedescaraibes.fr/file/tuzumutexirevo.pdf
    • http://sixtyguildersresearch.com/admin/photos/file/kivunegarodunasisorux.pdf
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160848ca536112---mikaravomoxagejuz.pdf
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160d1a2e58e2b9---11581636961.pdf
    • http://progfin.pl/userfiles/file/69795931047.pdf
    • http://thepokewave.com/uploads/files/kisatewufowimagepi.pdf
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/m8e8qbpn7j253741e1scs2bq83/buberazogotubixin.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=trivia+questions+and+answers+for+elderly
    • 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_off0000dde5.bin
eba4e74189940f83bf768f87e880597eed2879f22cba707139e24d17ad1c4c03		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDDE5 17656 bytes
font_01_sfnt_off00010b93.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10B93 16792 bytes
font_02_sfnt_off000123aa.bin
c5fd0e78c734c536013489b25387d0e753edc59141a07150a446756079f456ec		 pdf-font-stream PDF embedded font (sfnt) at offset 0x123AA 10820 bytes

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