Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7806733c0d9aa7c…

MALICIOUS

PDF

85.8 KB Created: 2021-09-08 01:21:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d9464d0fe1c51c2a071941beaf173af3 SHA-1: aebfb18898086f67b77a4d5ef0b7fca58faea791 SHA-256: e7806733c0d9aa7c38f7d25a91ad8a0f31006e13b931a7ebb8631d029f37f17a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to numerous external URLs, many hosted on compromised CMS platforms or disposable domains. While no scripts were directly extracted, the nature of the link farm suggests an intent to redirect users to malicious sites for phishing or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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://ukkies.be/userfiles/file/turuguzejufinekamom.pdf In PDF document text
    • http://bona-agra.pl/Upload/file/kupozarekanupe.pdfIn PDF document text
    • https://patoman.ro/ckfinder/userfiles/files/miwofivusovovepelet.pdfIn PDF document text
    • http://antifftech.com/uploadfile/file///2021050523590687.pdfIn PDF document text
    • http://textingrights.com/userfiles/files/nomikevojularup.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/drg58ip1h2gatj4gudiq55pum9/wepiva.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/xefob.pdfIn PDF document text
    • http://allasclub.com/campannas/file/seruxarojiwafok.pdfIn PDF document text
    • https://ratco-hardware.com/Ups/files/22775900638.pdfIn PDF document text
    • http://519pf.com/userfiles/files/44206110696.pdfIn PDF document text
    • https://syntellect.ru/Repository/file/vefoluzosoximulimidogenab.pdfIn PDF document text
    • http://studiomarazzi.eu/userfiles/files/44691960155.pdfIn PDF document text
    • http://componentcnc.hu/uploads/ckfinder/userfiles/files/79193620516.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/735984886eaf1678393355ef40d153d7/61213897251.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/3a95e281da11a598721da947ea11e951/petifisorinexome.pdfIn PDF document text
    • http://modern-pro.ru/files/file/wixaxebuzoxamimin.pdfIn PDF document text
    • http://russkiivopros.com/images/FCKeditor/file/89631263951.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0dabf288a4---benopa.pdfIn PDF document text
    • http://uniquecharacters.com/upload/files/56509772301.pdfIn PDF document text
    • https://bjjewels.net/nbloom/fckuploads/file/14725029908.pdfIn PDF document text
    • https://cpsguffanti.it/uploads/file/jopirazezarutiwabenov.pdfIn PDF document text
    • http://afslab.asia/upload/files/48999015103.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c4152d7ea52---paveduka.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099dc66d9e03---21045608026.pdfIn PDF document text
    • http://travelshops.pl/userfiles/file/boziwelag.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/ffe2c5358c6641a5f7a052570fc63898/3422591894.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=coping+with+stress+worksheetsPDF 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_off0000eafd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAFD 17976 bytes
SHA-256: f9c064d5c4c1383edc1563b217cb5c3ecca566a0a142b18f01520be95c837f2b
font_01_sfnt_off000119a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119A8 10532 bytes
SHA-256: fe3d62a65ba1bda82dace1789e408008d201341406b0af8cab30f961b544e32e
font_02_sfnt_off000131b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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