Malicious PDF — malware analysis report

Static analysis result for SHA-256 83a7823cb60d690c…

MALICIOUS

PDF

91.2 KB Created: 2021-08-01 16:23:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: f4d6bf9251f91e35fe094c20f8ff36d7 SHA-1: 9493412247ab552240e22ee0d21cfed1d013881f SHA-256: 83a7823cb60d690cb923943c90be6ea6ed358de07f0a2efbc4b4f33f89a12add
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to host malicious content or redirect to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://garglob.ru/uplcv?utm_term=que+significa+orinarse+en+la+cama+un+adulto PDF link annotation
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/r3uoqnp3hvlkf1l86s35sbd646/86691358468.pdfIn PDF document text
    • https://lapalettedesarts.fr/gestion/file/fitepuvifuzawuwo.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdeb18dc546---devatevigazibiwomikikibom.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/ad3a650c3ebe5cd0d27e621257b4f8e8/1030216526.pdfIn PDF document text
    • https://liniagdanskzydowo.pl/files/nubiwujitoxagovevoxidabe.pdfIn PDF document text
    • http://sanmarinreunion.com/clients/c/c0/c0747301521b2fcd71a0106c9132c7e7/File/pegigabaluvipijulenalu.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab2db78ce84---jibibufikebo.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/5704jpe84iimht3r92ik81gmde/2488656056.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b08f57dd798---roburorarevopexoxuralu.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1608a574992a3e---sivaresaj.pdfIn PDF document text
    • http://cs-golfclub.com/ckupload/files/11960808241.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/jg73cnjv0uo8r8mal68emdlu52/58326598140.pdfIn PDF document text
    • http://shs1977reunion.com/clients/41590/File/33253828347.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16072fbda00d36---74944904004.pdfIn PDF document text
    • https://prokoncept.hu/admin/blogfck/image/file/39169477720.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/diditibik.pdfIn PDF document text
    • http://9meclinic.com/ckfinder/userfiles/files/zipozedifog.pdfIn PDF document text
    • https://dodatnagarancija.com/userfiles/file/risujoloxobifof.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160bcb0d41a0f5---31004923194.pdfIn PDF document text
    • https://weboonline.com/ckfinder/userfiles/files/52330709509.pdfIn PDF document text
    • http://projectcom6wrk.net/ckfinder/images/files/gapekobotumomesidesawi.pdfIn PDF document text
    • https://tepihtrava.rs//files/buropawekovaviseparomodo.pdfIn PDF document text
    • https://bruceleevideos.org/images/file/9757439306.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/160727e3458564---dagulinokowim.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_off0000fca6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCA6 18580 bytes
SHA-256: ae7be73dddd179895793923c88cf3d03befe9952cb62cf1f44450abed61fc4a3
font_01_sfnt_off00012c43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C43 10980 bytes
SHA-256: d797d1df7321c13619e289f480385cc82c3241a93dd1a13b94a0ffcb933907b9
font_02_sfnt_off000145a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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