Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8ee3f8da923eafb…

MALICIOUS

PDF

84.4 KB Created: 2021-06-27 23:00:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7544fd8f441acc70608527cf0b8b7a45 SHA-1: 2e54019627505a356808f1704c18cfd6222b6d6e SHA-256: c8ee3f8da923eafb3c9d2b29c0c3e127bdb1b709a025490493d923f7a0c56026
156 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The primary function appears to be acting as a link farm to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://ck-tct.ru/userfiles/file/gejorozotipanowowegubaxe.pdf
    • https://mytopics.it/uploads/file/dabupawupixibomifakal.pdf
    • https://tlproduct.com/userfiles/file/28711741435.pdf
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081cb6d170b7---tazudevegikus.pdf
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/ab589301f9414d9ee198275ac2edd501/furobivixozug.pdf
    • http://libertyquad72.fr/userfiles/file/wanewuvejobejoxoma.pdf
    • http://lab4050.com/upload/editor/file/84579149689.pdf
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080adb71345b---31761977799.pdf
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071d103a3d7a---navagonedog.pdf
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607428e16ce10---48422630208.pdf
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/5d9f49e586792ca7f20a68df6222d7a6/luwitafaruselifigam.pdf
    • http://akcjonariusz.com/UserFiles/file/vobos.pdf
    • http://ajtoablakcentrum.com/_user/file/fepowawarivivesisijun.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abdb42a3fb7---36447054740.pdf
    • http://studiotecnicoprato.eu/userfiles/files/rosewedovove.pdf
    • https://africanresearchcenter.com/userfiles/file/8890608482.pdf
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/16080ee53b3728---20520350626.pdf
    • http://thebankcardservices.com/uploads/files/rozovas.pdf
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080f40341ae6---suxorejigosilofuri.pdf
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b622e0dfefb---77249527466.pdf
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aaf73edaf0c---robedusuxadolegol.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=sexi+video+new+hd
    • 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_off0000e8a6.bin
70e550cedd3d1482673c79924f9136d275fe66af3a8ebffe30cc8657c6c34f06
pdf-font-stream PDF embedded font (sfnt) at offset 0xE8A6 10100 bytes
font_01_sfnt_off0000ff1f.bin
df7b445c15233bb1c46dcad072e28ebb28a16744c8091c88c32699343653594d
pdf-font-stream PDF embedded font (sfnt) at offset 0xFF1F 17764 bytes
font_02_sfnt_off00012cf8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12CF8 16792 bytes