Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c83fe6bf2534c69…

MALICIOUS

PDF

92.2 KB Created: 2021-07-15 14:50:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c1efb3275d9ddff2b72a64e3b324401a SHA-1: 9327d558d98471069314aa2c0086e00ac861a8a2 SHA-256: 0c83fe6bf2534c691efd6af363515003f1ae4d74496c324b26cc167ee8b41895
156 Risk Score

Malware Insights

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

The PDF contains a large number of external URIs pointing to various websites, many of which appear to be compromised CMS installations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document's structure as a link farm on potentially compromised hosting supports this assessment.

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://pistant.ru/uplcv?utm_term=isolation+of+actinomycetes+from+soil+pdf
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/ecl3voecp5me7peju2f8011epp/fuvotikanenakezoleje.pdf
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1608f3683b5da4---tolixexar.pdf
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/0f2e448b173bee49fff6f9593f499601/lusenukibig.pdf
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160704fed05cdb---43868973465.pdf
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/0f45fb4ac1cab44745aec19f47fd81f0/99257118187.pdf
    • https://ijmscr.com/ckfinder/userfiles/files/7411695814.pdf
    • https://www.bistro-e.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a6cac33408---batuvumerilivofaza.pdf
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/32b5589781ab3c514b5f699b5f987206/wukexogaxalarirejoriku.pdf
    • http://samnakthodrahassob.com/userfiles/file/66352901587.pdf
    • http://akvari-um.ru/userfiles/file/79339179424.pdf
    • http://compufoxmail.com/userfiles/file/munerodorotozasogitelowe.pdf
    • https://congchung7.com/upload/file/3999399383.pdf
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/cg42dkusekondr3pi38uihco96/35750605253.pdf
    • https://cribpointonline.org/cribpointonline/userimages/file/gunosaxoxa.pdf
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/1607350135f098---jugelo.pdf
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/4d9adda33616e54dc3092a18328e4d37/demanuno.pdf
    • http://bukhatirhomes.com/userfiles/file/60406405158.pdf
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/9jonrdb2kaibk53t718comujgd/vazebezudojuserob.pdf
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/8n2as5an4ebvql5jk3us1dq21v/51307247087.pdf
    • https://naucharts.com/ckfinder/userfiles/files/29552765194.pdf
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/3e28f3a28265d75c2646fd0292e0c395/63410420984.pdf
    • https://floresdeserrezuela.com/aym_image/files/topokifusudibobo.pdf
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ae85a6b3789---womawaf.pdf
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/5n2vsc0o58l1ig613ssglq2h95/17217331767.pdf
    • http://phuocthuan.vn/images/pic/file/bijemubiz.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_off00010396.bin
ea04eef780cde4eeeddbe2b85ac0cb2e5bba4caa153121d697f2b25660aa555e
pdf-font-stream PDF embedded font (sfnt) at offset 0x10396 17200 bytes
font_01_sfnt_off000130a7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x130A7 16792 bytes
font_02_sfnt_off000148be.bin
051e298a6066ea5a95a94be2f760a3ea7ebc9b80032d97339ba38ae51d886c1f
pdf-font-stream PDF embedded font (sfnt) at offset 0x148BE 10848 bytes