Malicious PDF — malware analysis report

Static analysis result for SHA-256 2bc682f92b273d41…

MALICIOUS

PDF

96.1 KB Created: 2021-08-12 23:37:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 960e16a0566b4fa7623cff67b536d854 SHA-1: 27d73e66e6fbdeb4e1b80d955dfc6335c01c753e SHA-256: 2bc682f92b273d41325e1dfb6bbede7f29f53dd02cf21b1db12cc8a36757dd68
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a high ML score and ClamAV detection. It functions as a link farm, containing numerous URLs pointing to various domains, some of which are associated with compromised CMS uploads. The primary purpose appears to be SEO manipulation or redirecting users to potentially malicious content, rather than delivering a direct exploit.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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 http://moestuinwebshop.nl/userfiles/file/kamumazizaxisulo.pdf
    • http://cdseoulps.com/uploadfile/fckeditor/file/pifuwufadifotisuporut.pdf
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607fbce037be4---55197264542.pdf
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/1607c07c8e36b9---89526595464.pdf
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/16096515be9334---mejagosisezofidejemixen.pdf
    • https://ljlconst.com/admin/images/file/joguka.pdf
    • https://glbtrader.com/userfiles/file/24170433364.pdf
    • https://kildevangen.dk/files/24197767014.pdf
    • https://willmarlakesarea2040.com/ckfinder/userfiles/files/vukag.pdf
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608087cb28de6---fodenurobudawotubara.pdf
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/rchddover2fs71upjpcse6qqc2/1790406862.pdf
    • https://lochoanggia.com/upload/files/44033720530.pdf
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608467987d11a---kofolutikotuz.pdf
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1607212b2703ac---kabadireji.pdf
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/b2d85de9b1d534009fe57f1a2fcee667/nejibi.pdf
    • http://lukoilmarine.com/ckfinder/userfiles/files/pazaloxixuwiloralo.pdf
    • http://4grd.com/cmsimages/file/99341681618.pdf
    • http://www.christianhouseshare.com.au/ckfinder/userfiles/files/nisig.pdf
    • http://wskinbody.com/data/boardData/files/netigedananapowili.pdf
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfa05eecd94---rekonupo.pdf
    • http://softtox.com/new/userfiles/file/jasepisapodenoko.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=medical+billing+and+coding+study+material
    • 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_off00011417.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11417 16792 bytes
font_01_sfnt_off00012c2e.bin
604d80d9a520b29173486e9b0b3f74384f3b5d1b2df2b0811ddb07c26defdb18
pdf-font-stream PDF embedded font (sfnt) at offset 0x12C2E 11060 bytes
font_02_sfnt_off000145ae.bin
f2c8ed5313360b54b3abd0d3cbdff2eb85b4cb10e2b3cde0d2df81b5c4681293
pdf-font-stream PDF embedded font (sfnt) at offset 0x145AE 17172 bytes