Malicious PDF — malware analysis report

Static analysis result for SHA-256 7927290ba38f510f…

MALICIOUS

PDF

82.0 KB Created: 2021-07-22 14:05:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d102fa58204ab4c16119108830108af9 SHA-1: fb0e98763c2061744ede16359695842aa7c0ae99 SHA-256: 7927290ba38f510f0ba04959a72b6e496181646c9115354db327ab5a9bc5da07
156 Risk Score

Malware Insights

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

The sample is a PDF document identified as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The primary function appears to be directing users to external, potentially malicious, websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/1kmka01pnokq9hq7r9up8htef0/13476628789.pdf
    • https://pelicanfinancialnetwork.com/ckfinder/userfiles/files/tawun.pdf
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160768d97949ef---kusamiwoxegijedogiz.pdf
    • http://cyklo-sport-servis.cz/UserFiles/File/40869574261.pdf
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/hfsoe1dr7hkk426hp2o4i235ga/97725324814.pdf
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/48vft4h5anomjf4nrq4f0d8vc4/bonajafukoxirafinimabip.pdf
    • http://universalgroupautos.com/files/others/wepejazapemimenixikodeke.pdf
    • http://pressvaluation.net/userfiles/file/sidavizoziwijilajafusoki.pdf
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607037b8a22e2---75164351323.pdf
    • https://dadesigning.com/daduserfiles/files/gepeteviba.pdf
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cfcfaa3c6ab---redewaz.pdf
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/n3h7tne7nsogumnrmq6vocoar1/pesovafuwikurorisuzaleniw.pdf
    • https://munord.com/wp-content/plugins/super-forms/uploads/php/files/088cbfc285b8b55efc31f1b10014e07f/bikapupusesalasuwepiv.pdf
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094804235b00---66392755656.pdf
    • http://bright-mineral.com/uploadfile/file/2021060104452155.pdf
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16092e585c25d9---xegufejazuwixetumu.pdf
    • http://fullcolorspandoeken.nl/userfiles/file/99432754001.pdf
    • https://qualitylightsolutions.com/wp-content/plugins/super-forms/uploads/php/files/a0a0446f3ecbfe59cc4bbd6175b9bfcf/35299849998.pdf
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/1551fdb11b342f37f875700bd3dd829c/tupipiregabivojolurowur.pdf
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078d72f00d50---rujoxujezuniku.pdf
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/fbe8vul0h15op9q8no3mctqgl6/zipiridal.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=convert+from+cm3+to+dm3
    • 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_off0000da4e.bin
6ec15cadb1193ddb61cd5c23b0ad0f731cef2a3bc23d5950d1c0d807aa5d6f49
pdf-font-stream PDF embedded font (sfnt) at offset 0xDA4E 18376 bytes
font_01_sfnt_off0001096d.bin
46c97f19842f9549ebcfced12e1e415e65d74b9cafd1134eead43d3ea9c0c030
pdf-font-stream PDF embedded font (sfnt) at offset 0x1096D 10440 bytes
font_02_sfnt_off00012130.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12130 16792 bytes