Malicious PDF — malware analysis report

Static analysis result for SHA-256 e963ce3e1585568c…

MALICIOUS

PDF

73.6 KB Created: 2021-09-21 14:53:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1908c23d6a55747f2893027e9c86e083 SHA-1: d28f8b73ae152c0e4e770a1f3aaef0b65add349d SHA-256: e963ce3e1585568ccfe2875621a725d178340c49b7d57c30155cbcfe2422f8fa
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users to potentially malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://scea.edu.mn/ckfinder/userfiles/files/7739693335.pdf
    • http://straps.by/ckfinder/userfiles/files/rowanotasisisov.pdf
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/16133e8bb3491e---26566724036.pdf
    • http://divapharma.com/uploaded/file/67893257023.pdf
    • https://oancora.com/ckfinder/files/67515386260.pdf
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/0319f4ad2c7eaf31c4794b71a61549d2/51395005857.pdf
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/161480b2c1701b---56458171889.pdf
    • https://drticket.ir/basefile/drtiketcom/files/parakara.pdf
    • http://www.hermosabeachbungalows.com/userfiles/files/53130397388.pdf
    • http://tencanpowder.com/d/files/41506732215.pdf
    • https://chongtham68.com/app/webroot/uploads/files/96652591097.pdf
    • http://acudrved.com/ckfinder/userfiles/files/geviwos.pdf
    • http://datacomsystems.cz/userfiles/file/giposi.pdf
    • http://indemo.pl/Image/files/99552823497.pdf
    • https://devcons.org/uploads/userfiles/files/mojojuxu.pdf
    • https://promenade-perpignan.com/userfiles/file/2066098432.pdf
    • http://www.accessibilite-salle-eau.com/ckfinder/userfiles/files/76912557750.pdf
    • http://flemingdecal.com/uploads/assets/file/40836763918.pdf
    • http://tmtechvn.com/webroot/img/files/lezemuzupo.pdf
    • http://optimumnieruchomosci.pl/uploads/userfiles/files/36212260523.pdf
    • https://commonwealthsportsawards.com/userfiles/file/suginasozolujomesaku.pdf
    • https://dutchfansitenetwork.nl/ckfinder/userfiles/files/jitekazoxaxunave.pdf
    • https://nstoplana.rs/ckfinder/userfiles/files/92016154455.pdf
    • https://unitedfightalliance.com/ckfinder/userfiles/files/84754841162.pdf
    • https://atasuorganiktarim.com/upload/ckfinder/files/zasaberozofobikuwiva.pdf
    • http://massimobertoarchitetto.com/userfiles/files/kejipafedobon.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+open+thumbdata
    • 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_off0000bdb5.bin
cb7c13175ebaa1db84cc55bb2320c5ab40a64971a32b9e9b83832006dcaab373
pdf-font-stream PDF embedded font (sfnt) at offset 0xBDB5 17004 bytes
font_01_sfnt_off0000e961.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE961 16792 bytes
font_02_sfnt_off00010178.bin
0838262d5a2b72ed0ad0e2e2c0ec2d78da7ced9c9f0d62510f9cd3f0a0a07f44
pdf-font-stream PDF embedded font (sfnt) at offset 0x10178 10568 bytes