Malicious PDF — malware analysis report

Static analysis result for SHA-256 3975c8d64103e4a2…

MALICIOUS

PDF

81.7 KB Created: 2021-09-04 19:23:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a89655eb4345d8365f8b9e62718a48c1 SHA-1: 7dce99ded8aa6c24326b40a94070bbd1e0309adb SHA-256: 3975c8d64103e4a265864342874d4591b7e02c3ddc2e46971e265004c26cea82
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised WordPress upload directories or disposable hosting, suggesting an attempt to lure users to malicious sites. The presence of a link farm on disposable hosting further supports a phishing or redirection attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/2c1e57c6e2800ab3fa3154987e426e4a/62238302108.pdf In PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/99833024105.pdfIn PDF document text
    • http://arohitourandtravels.com/userfiles/file/jilazudofuxijim.pdfIn PDF document text
    • http://pwr-tech.ru/userfiles/file/senotenoxufanifawijuwoda.pdfIn PDF document text
    • http://topoint.cc/userfiles/fckFile/20210701004605.pdfIn PDF document text
    • http://emke.hu/uploads/ckfinder/userfiles/files/bupepudizokapaxevate.pdfIn PDF document text
    • http://grafiport.com/userfiles/file/69180646229.pdfIn PDF document text
    • http://wami.cc/data/files/62438507906.pdfIn PDF document text
    • http://isdoor.ru/uploads/files/rakupupuzazipujo.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079dbfada291---gokib.pdfIn PDF document text
    • http://vijyaiprismcrm.com/userfiles/files/466656886.pdfIn PDF document text
    • http://redeyeldn.com/userfiles/file/kololuribazo.pdfIn PDF document text
    • http://phenix-security.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607d100201dc3---vepurerojifopurorowi.pdfIn PDF document text
    • http://nakatka.com/files/file/90490878461.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/lbdtfrfuuslepnp54pjiuanukp/robewup.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/kf0jaf9g21tm9aojha3ld5ip6p/2022894780.pdfIn PDF document text
    • http://kientrucnhacuagio.com/upload/files/19438530065.pdfIn PDF document text
    • http://atenngo.com/admin/sites/site/documents/rukof.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/tapejiradedipudoxoxovivip.pdfIn PDF document text
    • http://griswoldremgmt.com/uploads/files/xasulatededibow.pdfIn PDF document text
    • http://ebsenglish.net/_UploadFile/Images/file/53938805062.pdfIn PDF document text
    • http://1hozain.ru/files/userfiles/files/kofigiradujepokejal.pdfIn PDF document text
    • http://p-itos.net/admin/userfile/image/file/gowololitugovawinuwuxar.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=primary+health+care+management+pdfPDF 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_off0000dafe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAFE 10896 bytes
SHA-256: a7ed20ff04a5f8b515a3452e3b51d0b49feeda0c6b164f2122bfbf9cf5d73f1e
font_01_sfnt_off0000f3c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C9 17640 bytes
SHA-256: bebde8d0aa32bd33eb39850d18034f15524da5fe6a78ede40f0041b88e3abb51
font_02_sfnt_off000120dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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