Malicious PDF — malware analysis report

Static analysis result for SHA-256 286208142fc79821…

MALICIOUS

PDF

90.6 KB Created: 2021-07-30 02:15:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 0addac9dc232bb708d8865c445b5447b SHA-1: a8004dd15efe83fd1294f645d588b001040d8bdc SHA-256: 286208142fc79821f9d61df26e5a8d5b45b25c9133313423918dba4243dc57f6
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to numerous external URLs, many of which are hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The PDF structure itself is indicative of a link farm, with a high number of distinct hosts and links per host.

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://sam-global.info/files/file/segevopamoxegusitiwo.pdf In PDF document text
    • https://artenika.pl/fck/file/74250542674.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/igfj0970rmfe2ea34pblqj87h4/74998497561.pdfIn PDF document text
    • http://ixtvs.de/_upload_bilder/_filemanager/file/megalozopet.pdfIn PDF document text
    • http://tksvolga.ru/userfiles/file/woxorex.pdfIn PDF document text
    • https://associazionedynamica.it/uploads/file/46734935182.pdfIn PDF document text
    • http://adaviestransportltd.com/userfiles/file/62522086350.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7f910ef794ff7f0584bfb0694378dfe5/riteratowamapuv.pdfIn PDF document text
    • https://gulfsupremesa.com/ckfinder/userfiles/files/legibigosobupowosenatapa.pdfIn PDF document text
    • http://vrtaspol.cz/klienti/devel/sneznerolby.cz/ckfinder/userfiles/files/zewasijetobarodorexowepo.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/987658e5d050d447eab7d56a528b38ed/33752440357.pdfIn PDF document text
    • http://mai-colle.jp/userfiles/file/rorux.pdfIn PDF document text
    • http://soldresold.com/Shradhdha-Mehra/soldresold/final/ckeditorimage/files/89108152052.pdfIn PDF document text
    • https://aimtronu.org/userfiles/file/mobevajazidadatos.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607821a19d461---42427705497.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/c6d7544f3d0d2270d076e04a901ac627/gawoz.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084fbd1c7f15---duxejosakularafe.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f113ed6743---pufofugigokawibumefuve.pdfIn PDF document text
    • http://ithaca1966.com/clients/8/85/85e9e0a76fddb83d7689cebc6ab07fae/File/filimonixenevujanuzu.pdfIn PDF document text
    • http://effektfilm.de/files/file/13723626221.pdfIn PDF document text
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088b05d1234a---55046174949.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/3m1sr9h546ubtvkt2qakjtdam2/lumapus.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160afa9a259e2f---pobovesowunufuj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=quick+easy+riddles+with+answersPDF 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_off0000fe6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE6C 17320 bytes
SHA-256: 1e5fd7a08ae6d4270688efca8554214161c2e1d1ab8768ca58fde668ca4511c1
font_01_sfnt_off00012b6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B6C 10800 bytes
SHA-256: e23bc77e06d8cc5a70b3a3cd20aa2ac6462c50c4931b0ca3ccbaefdabbc0bcf2
font_02_sfnt_off00014472.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14472 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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