Malicious PDF — malware analysis report

Static analysis result for SHA-256 62b344608e0f8a81…

MALICIOUS

PDF

85.9 KB Created: 2021-09-07 10:06:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 02b90c44a1c16214d146df66a26dbdb8 SHA-1: c3fda1dea38ff9a69fa259f0e8095d99036143df SHA-256: 62b344608e0f8a81c6c2762ac7ff4e1f19c7408a1db07056c6fdc3959af291b1
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to compromised WordPress upload storage, suggesting an attempt to lure users into downloading further malicious content under the guise of a PDF converter. The presence of multiple unknown URLs hosted on various domains reinforces the phishing and malicious download attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16070e4b87e4dc---8590871339.pdf In PDF document text
    • https://cahayamimpi1.com/contents//files/fadodopowolezalogijajufo.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4c54237bc8---bavolumebibojem.pdfIn PDF document text
    • https://al-farh-iq.com/upload/userfiles/file/xivetexekupixerobu.pdfIn PDF document text
    • http://vet-arrighicolangelicristilli.eu/userfiles/files/zevatiliwokotuzu.pdfIn PDF document text
    • http://cuboni.com/uploadfile/hong202107260608563998.pdfIn PDF document text
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607461dd276fc---9961008637.pdfIn PDF document text
    • http://kleinschaden.expert/userfiles/file/4594055619.pdfIn PDF document text
    • http://omg.su/upload/File/10273920401.pdfIn PDF document text
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/160700a1b8a8f4---mudobo.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/cf9410384a47112f7c066ed80aa4d827/fozilogegozi.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/4po5a43to866genohs4cv6hhs0/wafefile.pdfIn PDF document text
    • http://minhphucvietnam.com/uploads/userfiles/file/12328555963.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607a9be3c5d74---65546108881.pdfIn PDF document text
    • http://clarksville.net/wysiwygfiles/file/71896082201.pdfIn PDF document text
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/ivaakfrsnqe7740dkcol8c1hi0/24810347848.pdfIn PDF document text
    • http://pcwenhua.com/uploadimg/file/162910957667537768.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5825ec4b8e---67675319407.pdfIn PDF document text
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/bb5cb73b409d9a094b583cbffebbe58e/gesapatikaf.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/c41g1gpk1cp81pblgeb3efgu47/25421331059.pdfIn PDF document text
    • https://bomberosdenavarra.com/userfiles_nexo/files/29973544500.pdfIn PDF document text
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087b515b3a6c---xuvogobevoxageduwiremo.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082001a0a254---56634030236.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=telecharger+convertisseur+pdf+to+word+gratuit+windows+7PDF 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_off0000e66e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE66E 18996 bytes
SHA-256: d1e2704d0034cf70c3731447673b0074a8a72370902716dd82f7955c6eb1af03
font_01_sfnt_off000117b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012fd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FD0 11164 bytes
SHA-256: a03f02ba0701893f47802e2fcf5e457204b413a19b0d6d905c5fd1bf7ee1f1d2

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