Malicious PDF — malware analysis report

Static analysis result for SHA-256 955b3081702536cc…

MALICIOUS

PDF

87.5 KB Created: 2021-07-03 01:52:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d7b8b668c1f0d7a5d59ab0e0af2636e9 SHA-1: 11a1c0fd641b33b40975ca434419047cd21ed0b5 SHA-256: 955b3081702536cc69b0e43f5e74a77f183b345379a5155bd34d8c36a8d2aebe
156 Risk Score

Malware Insights

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

The file is a PDF document identified as malicious by ML classifiers and ClamAV. It contains numerous external URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The presence of these links and the overall structure indicate an attempt to lure victims to malicious websites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://smidgel.ru/uplcv?utm_term=alice+in+wonderland+alice+falling+down+the+rabbit+hole
    • http://arunimaflavours.com/userfiles/file/95524604947.pdf
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/de05325dd7f0474c5c88feb2eb9f72ca/bamudakusemovebaliludo.pdf
    • https://media-get.ru/userfiles/files/toxifajivajagijebo.pdf
    • https://holocaustresearch.pl/nowy/photo/file/92041796753.pdf
    • https://bamfieldrental.com/userfiles/file/31706363046.pdf
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/d0923247d0b078f998b6e4621065c8e5/73086855165.pdf
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e5c28e53f0---67776234110.pdf
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a9a421585bea4d666486787720321372/67542671842.pdf
    • https://songhong-thudo.com/img/files/79214484961.pdf
    • http://sosnovgeo.ru/userfiles/file/50792604869.pdf
    • http://minuspk.ru/minuspk.ru/userfiles/file/vonusikinoduxikogewonavup.pdf
    • http://tcurryproperties.com/konadnew/userfiles/file/24185209598.pdf
    • http://vinhthuan.com/upload/files/15747999807.pdf
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608c38e428217---vojurisebag.pdf
    • https://securityguardsupply.org/php/uploads/file/31509264618.pdf
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f7371441bd---vowexenejevu.pdf
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160df869c77ac1---vunanitenorobipugaxewokud.pdf
    • https://www.deuba.info/wp-content/plugins/super-forms/uploads/php/files/q33es0p0icoglqcmubhnnrva9k/64457841741.pdf
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/998ab03c5630e233477b93240178640c/75966447098.pdf
    • http://rheumatology.institute/upload/content/file/pewawo.pdf
    • http://ucity68.com/clients/e/ea/ea220da86df44fb0ae3b7c8e8295ccc1/File/28202549802.pdf
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160d02be179ade---moditasazamuwomosij.pdf
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f8bd3f3ce7---vevunopajosone.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_off0000eec4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEEC4 16792 bytes
font_01_sfnt_off000106db.bin
6507de2ee7fde4edfc05861b244124d91740f3d96c77eb358f70f60fe646fe60
pdf-font-stream PDF embedded font (sfnt) at offset 0x106DB 10796 bytes
font_02_sfnt_off00011f82.bin
b5051a55d08bf018ee661e27b760e2450241237a2eb80be5795ec529619ee585
pdf-font-stream PDF embedded font (sfnt) at offset 0x11F82 17724 bytes