Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd18b272f749677d…

MALICIOUS

PDF

99.6 KB Created: 2021-08-17 05:30:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2544b8f6de6c5403b2067b1248d8bf39 SHA-1: a6c2afb040e546b7e96d30aa908f2e2e0640d75c SHA-256: fd18b272f749677d2b8e129a7a43ef2ba49882d03fcc8d44dd9b3c258041a2c3
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document functions as a link farm, containing numerous URLs that point to compromised websites and disposable hosting, suggesting an attempt to redirect users to phishing or malware-hosting sites. The presence of multiple external URIs and link farm heuristics strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://medvor.ru/uplcv?utm_term=does+ecu+need+to+be+grounded PDF link annotation
    • https://ebooksweb.net/files/file/65650414947.pdfIn PDF document text
    • http://www.anjhimayath.com/upload/file/majejajatikoz.pdfIn PDF document text
    • http://fotostudiovaccari.it/userfiles/files/30602812688.pdfIn PDF document text
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/8f3a88af114c6b20d8213ddfae9db1b7/27390483293.pdfIn PDF document text
    • http://51-lq.com/userfiles/file///25551178147.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/4b810b8c9b0b182cc1d91fca84f56dd4/97684322614.pdfIn PDF document text
    • http://sysquare.com/UserFiles/files/17396578430.pdfIn PDF document text
    • https://cleartunemonitors.com/ckfinder/userfiles/files/munuvopazetabirezofi.pdfIn PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/7g8ulquqgqmss4doir5jfj8tnh/51880148732.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/161025e37210b0---vurujizigujudaze.pdfIn PDF document text
    • http://dharmapuridiocese.com/svnprojects/DHD/Source/images/files/52337087507.pdfIn PDF document text
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/7e828a79ee3666079781cff4ebc86745/39170607540.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/cvoqi8ou0tucrgmms92m1r3a27/85809128334.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070c3e935456---416080494.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/2s07t43uuljn1saj2sg06outlr/53041889741.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/eddcd32ef5d0dae9bca01542923e27bc/vokarepibiwodopuv.pdfIn PDF document text
    • http://ricarda-allegra.de/userfiles/file/pojuw.pdfIn PDF document text
    • https://tlpnw.com/wp-content/plugins/super-forms/uploads/php/files/9aca3bbb55a9d649f89bb106e5247be3/96754712903.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160704758ee9f2---dekobexuseferasa.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/muluzumosafoguredumovis.pdfIn PDF document text
    • https://daleplumbinginc.com/wp-content/plugins/super-forms/uploads/php/files/42b27ebfb3c63c3a53e827a08a586546/pelefepuzekunil.pdfIn PDF document text
    • http://e1pl2.nazwa.pl/busy/fotki/file/87798553745.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012224.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12224 10488 bytes
SHA-256: bfcca2614b2e0d7e0cd5603c88e552eec8a2127da44498af2d8bacc155902b37
font_01_sfnt_off000139e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000151fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x151FA 17608 bytes
SHA-256: f692e5fa91f3c9567df62c4b399a7db2519bfff2b0e41c46bbb62b31cf74c173

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