Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbd650735b2d0fa5…

MALICIOUS

PDF

88.1 KB Created: 2021-09-06 10:17:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0289c005fbe77aaf00510fe150d907e8 SHA-1: 820252f5dead33744f7172d6bfce0472e2108cb0 SHA-256: dbd650735b2d0fa5825a6a766c1a2b62ce95b5efabcc7d18e4d9146ba7ac0a95
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised websites and disposable hosting, suggesting it's part of a link farm or phishing campaign. The presence of embedded URLs and the nature of the heuristics strongly suggest the document is intended to redirect users to malicious sites, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://crysiq.ru/uplcv?utm_term=fiat+600+tractor+repair+manual PDF link annotation
    • http://gzperson.com/uploadfile/files/gagikotojibexufibozo.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16080247963d56---xitoxexemimoxuwavexukakop.pdfIn PDF document text
    • https://mysmartedu.com/uploadimages/files/xiwepifusilorogozuju.pdfIn PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/6bc0evr0u6bvhnajorshhtnif5/lilanipilupu.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/07c7ff74d76dc932c8e3bfdf98c55544/pujolakufuzaxipuwosisug.pdfIn PDF document text
    • https://unaizahic.com/Files/files/dugowigojo.pdfIn PDF document text
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/n3e2kaboajlsag1386736l1pl9/gubafavazemisivosafizij.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/160d85fc33d322---74153363144.pdfIn PDF document text
    • https://bem-sa.com/img/file/newonimakasiro.pdfIn PDF document text
    • http://uleshuzatshop.hu/files/file/mevotugakamivovonutez.pdfIn PDF document text
    • http://apvn.info/userfiles/file/15460945071.pdfIn PDF document text
    • https://www.analfissur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d57f276697---zavoviburi.pdfIn PDF document text
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/b47virci9lnmj2kjr64ecfmke3/82293722456.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/16099b5d36082b---sojezesigikoki.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/qvv1icritpp28kjg0ldogh8gd0/gupiwujaga.pdfIn PDF document text
    • http://gokea.org/upload/editor/files/14125100822.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160afab163a2fa---8134660814.pdfIn PDF document text
    • http://kjphotocon.org/data/userfiles/files/dugexijulotagiwiva.pdfIn PDF document text
    • http://areawifi.com/DESARROLLO/userfiles/files/45194651987.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/160ae1dd083102---96426176540.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160de70f8bbe00---zojosika.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160987faecd97f---lejivejopamavuv.pdfIn PDF document text
    • https://jjpremiers.com/files/gadibegubagoxexinepupibod.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_off0000f68f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF68F 17036 bytes
SHA-256: 992678e0b7b86f97b13683cb4232ba5d55d8df96dd37702b9a316e54b1d85c7e
font_01_sfnt_off00012272.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12272 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013a89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A89 10732 bytes
SHA-256: 2a00dfc45014aa0e4e5b7b74c7fd145d227b5fc42e271725ea4d9ebc744beba2

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