Malicious PDF — malware analysis report

Static analysis result for SHA-256 a09cf6f87839f80d…

MALICIOUS

PDF

80.7 KB Created: 2021-09-01 13:01:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6cbb2ea1427055fd662cfc5f7bab2696 SHA-1: 72911236741a481f16936d0dcc0ec065f774a63d SHA-256: a09cf6f87839f80dc525f55c223aa52ecae27795dd241fbd606e17d2d33c7199
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It functions as a link farm, with numerous embedded URLs pointing to compromised websites, specifically utilizing WordPress upload directories. These links likely lead to further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://dansobentre.net/uploads/file/60201540973.pdf In PDF document text
    • https://cgeminfos.ma/upload/file/lorimowimuvagiboxeko.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/tf3kscdrgf9kanc0ctrc1h2egs/kubefikedadu.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/e5bf80a6132de2c05fee284e0a5f52d5/7239048798.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/9lfqs648kc21p77ptt0u0vbo17/xewofewabepa.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b856fb116fe---57473873737.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/df10eafd9a2fe3e48822586bc0637578/43462323232.pdfIn PDF document text
    • http://longthinhphat.net/uploads/files/8528835691.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/7399c438f0bc7706ecce4742e1fc6aca/52993363689.pdfIn PDF document text
    • https://cakkue.com/contents/files/jukonowekinalug.pdfIn PDF document text
    • https://apskarota.org/userfiles/file/90927264608.pdfIn PDF document text
    • http://speakingaboutnetworking.com/ckfinder/userfiles/files/salesunababataw.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/0763723086aa5b34000c331a89b6ee0e/xilidurefijavulazaboku.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098ccd81ec05---sugimakutojiroke.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/34972638251.pdfIn PDF document text
    • http://qdxqw.com/uploadfile/file/84048869234.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/c42hm8ddfhg34so1d6k2r2389g/jodojabitesavexonol.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0b2d83b9dc---42068535035.pdfIn PDF document text
    • https://ferest.ro/imagini_ws/zetekomomokidukaruretu.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/05f0ae23b21bc8b861271af003cae3c8/66812216448.pdfIn PDF document text
    • http://sankofalectureseries.com/clients/a/ae/ae3037074ff26ae8502dacd236f4ced8/File/zolozekokikotosijawupemof.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=matilda+and+the+witchesPDF link annotation
    • 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_off0000d6b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6B8 10328 bytes
SHA-256: 591d80bf12f6c96828bb84104c5f6207d9f4ab759496dde959e873149970fd72
font_01_sfnt_off0000edf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010606.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10606 18128 bytes
SHA-256: 28452fbf130d444c3057d9ad6889142c16cea1624e0f17722f13faeb3ca8a6da

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