Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5a7614fe707523b…

MALICIOUS

PDF

80.4 KB Created: 2021-07-01 21:02:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8a3c623b5c0451b60cfd653ceadc8d7f SHA-1: 1291885b4b9d00b7fa3e6f2e1ead940b9045eb26 SHA-256: b5a7614fe707523b083696ef8d74e697da10e4eeeabb1a43717a6d55198e4839
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting it's designed to redirect users to malicious sites. The embedded URLs, such as http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077dcc096ac7---givatukuzejujewogevevon.pdf, are key indicators of this redirection behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://datawire.gr/files/files/56316557898.pdf
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/c961f9287dc59938faf92cead842ae1a/36761244786.pdf
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160d97767f3627---wajajuvijepupig.pdf
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3ccf70621b---10183529475.pdf
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/38bcc72856bd1eff1b6a03221e7e43ed/25860230055.pdf
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/16073096add9b1---zefurobudaniferaselof.pdf
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608896e442344---jumux.pdf
    • http://mosjob.ru/images/file/piserosenusat.pdf
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608da2bb3dee0---warafupobenov.pdf
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/k9elfu9akhnns1hvo47qmn9vc3/73555587123.pdf
    • http://hakkabrothers.com/userfiles/file///23883874206.pdf
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/zisafapagesamedalotoweg.pdf
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/a315a880c65ef0cc793e406df3bd59d5/91916632263.pdf
    • http://kraski-chernila.ru/resources/file/vuminulisigula.pdf
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077dcc096ac7---givatukuzejujewogevevon.pdf
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/qpe7moac8d3emrbqd59en2iv5s/71757301461.pdf
    • https://bednidhitraders.com/userfiles/file/68663097161.pdf
    • http://rbtyutj01.com/userfiles/files/37706671611.pdf
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/5lfmunb2394oftbbqufn1ai5pp/loruweguwopurune.pdf
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/ea13ff9a924c9245792d98c22d5c3dd1/25900764970.pdf
    • https://bleikss.com/userfiles/file/48024938481.pdf
    • https://everywheregenes.com/uploadfile/qu26_qu106_com/files/fidugonagis.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=pdf+extension+for+word
    • 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_off0000d8a2.bin
82cffeeb87bfa17c8a241920fe417b48939d1de70679c86569101ea8693968f3
pdf-font-stream PDF embedded font (sfnt) at offset 0xD8A2 17084 bytes
font_01_sfnt_off000104fe.bin
bbe03ba6040cfb0381066ca2e596b8166896fe71449887f4741725f58f6def38
pdf-font-stream PDF embedded font (sfnt) at offset 0x104FE 10328 bytes
font_02_sfnt_off00011c82.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11C82 16792 bytes