Malicious PDF — malware analysis report

Static analysis result for SHA-256 abd2ac4eae19df2e…

MALICIOUS

PDF

91.1 KB Created: 2021-07-01 00:24:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 66bdb5b425d81a247f6ec5a9ad7a2e69 SHA-1: 93edfc134855b2aefdb9d2884dcfa8217be05255 SHA-256: abd2ac4eae19df2ebe5513c90a094ce027c9177c03ac1c1372b12c76ef1b241f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the primary attack vector appears to be the exploitation of user trust through malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://synerhu.ru/uplcv?utm_term=an+artificial+pacemaker+is+implanted+subcutaneously
    • http://rgn2u.com/userfiles/files/zasorixariseseri.pdf
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/lh88bdh64kjo9il5h0p9g39rde/nujeni.pdf
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160bd402195bf7---zinedigobaveguvarubaledux.pdf
    • http://www.ipkameralari24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d68b2ebbe39---xosupatexazomulu.pdf
    • http://cnokorea.com/userfiles/file/fugafobuzakubunin.pdf
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160775ccecbb2d---7474563014.pdf
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607ba1d07fa51---nimititogiwodosomeniri.pdf
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/3831df129c3f65956c3612a2a418f5de/kolor.pdf
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/e7c3f6d4b3e4c5179a526b057c2583ca/dorajapufubi.pdf
    • https://kalitelivideoizle.com/resimler/files/64329871262.pdf
    • https://islandsvefir.is/wp-content/plugins/super-forms/uploads/php/files/pcd3cse99agsvank76tlvsb7df/detereki.pdf
    • http://bmcnx.com/userfiles/file/9262264494.pdf
    • http://thuephotocopytaihanoi.com/upload/files/18928431091.pdf
    • http://cn-junsheng.com/upload/file///2021621184331969.pdf
    • http://stphilomenaonline.org/userfiles/file/segelatotebofijeti.pdf
    • http://stinpo.com/ckfinder/userfiles/files/66643052359.pdf
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/02038bf10cf53d56e042466c4cd90748/ririgimos.pdf
    • http://alphabodysupplements.com/newerac2c/userfiles/file/fozonukokemibipunaboz.pdf
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a6d3ad83469---84010217759.pdf
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/kmqjrast73374q02978c6malup/87531693835.pdf
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c49703eff0---65211117804.pdf
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/31801523893.pdf
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/76842c54ed23ec3b5cf8387351cae288/tumukurikuvi.pdf
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/98e79ae53c7bd4008c293294a5d7a21f/rekuzelezado.pdf
    • http://ghalemdi.com/userfiles/file/joxireva.pdf
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/a880f911ea1b430a76d0433903efc51d/85232379901.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_off0000ff89.bin
4e171d1d3e9e1ff4c62c40aeff24a2a95a35b4b70261f8cf3301dd1582979710
pdf-font-stream PDF embedded font (sfnt) at offset 0xFF89 17324 bytes
font_01_sfnt_off00012c72.bin
3bc8e6e753c1f6ca01114425e635d3cddc2fefddeb46c603a82059bc81b43a87
pdf-font-stream PDF embedded font (sfnt) at offset 0x12C72 11208 bytes
font_02_sfnt_off00014686.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14686 16792 bytes