Malicious PDF — malware analysis report

Static analysis result for SHA-256 e600cd988b55e2e2…

MALICIOUS

PDF

85.7 KB Created: 2021-06-27 10:45:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9667e1b6946c9eb158f25a062595203c SHA-1: 5df2d40d2c5927982b309a39553e9dee0faedaac SHA-256: e600cd988b55e2e2a369aea5543054726fbf1130805810307f84c3a1329ac7cc
156 Risk Score

Malware Insights

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

The sample is a PDF document flagged by ClamAV and an ML classifier as malicious. It contains numerous links, many pointing to compromised CMS upload directories, indicating a link farm designed to redirect users. The presence of multiple distinct hosts and the use of UTM parameters suggest an attempt to distribute malicious content or phish for information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071d95e5bc89---tolejadobuvumatodiratobeg.pdf
    • http://aep-tc.com/cache/fck_files/file/94525992698.pdf
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/acnm9fjtu3ovibq68s01ooa7t4/22977784756.pdf
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608447e8938e2---27888000008.pdf
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/0rg4e7nu695duuabm7b438ei76/mebeze.pdf
    • http://kovacsoltvaskerites.hu/images/file/dofexeladi.pdf
    • https://latework.cz/soubory/defupomudukazitezuweli.pdf
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6bf0cbc8ab---rewizapap.pdf
    • http://aimic.com/userfiles/file/wivakurukurefevitosovi.pdf
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/1608ff5500e7c7---78824397594.pdf
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/16073e53beb04f---xirapoxozipetejojumi.pdf
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/fpp00u7chijv5l43b1v0335s07/kimejoso.pdf
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a8c6eea5b98---vupazujazegewopagixuzaru.pdf
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/addf20eca54451ed74fc1d60b8a527ae/xelujozexe.pdf
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/c112c9cafa3c912cfeb663754078d953/71045891948.pdf
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16080056d3d2dc---kujojirosegu.pdf
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/43cc9fe0ca594ca1a9eccacbdc410a6c/99992464795.pdf
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/fa6237468f1eaac0b0ee7a705d0d3a0d/68947224551.pdf
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16079cd8c093e2---90203129216.pdf
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608d14b29cfd3---30732496266.pdf
    • https://diaochue.vn/userfiles/file/kizorumox.pdf
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a7337b2d11---39974754122.pdf
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/102694b92c99dcd18c7faddb4cb97674/17474997644.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=pinworms+in+poo
    • 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_off0000eed3.bin
f18c9f4216b6f10af86921ce934a77493900d4ec65047691ba83656a5b97c3ff
pdf-font-stream PDF embedded font (sfnt) at offset 0xEED3 17088 bytes
font_01_sfnt_off00011b46.bin
fec9618743b2d74f273253ed07ed6db4b563c254e222da35994ed8c994e639a2
pdf-font-stream PDF embedded font (sfnt) at offset 0x11B46 10060 bytes
font_02_sfnt_off0001319e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1319E 16792 bytes