Malicious PDF — malware analysis report

Static analysis result for SHA-256 b82b1150d61c5b98…

MALICIOUS

PDF

69.7 KB Created: 2021-09-25 05:24:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 54333a2c12d2cd082bb0b2de1f78d211 SHA-1: 7f55a4fd9027934e7a5888f19e1436a1b0c51b5a SHA-256: b82b1150d61c5b9854cc7e1ecfc882267a84c9370ce8c4a6612f80616257ae14
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating it likely exploits a vulnerability or is part of a phishing campaign. The heuristics reveal it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS platforms. The presence of numerous URLs suggests an attempt to distribute malicious content or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://kstarsmall.net/userfiles/file///57638827593.pdf In PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16149d6642ff37---35836336997.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fb1ae911a0---pugafevigaruribekavot.pdfIn PDF document text
    • https://grup-insaat.com/userfiles/file/lejasazebas.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161491094109ca---tidikajujote.pdfIn PDF document text
    • https://fenixfalt.com/userfiles/file/vogexeduzitebetobuma.pdfIn PDF document text
    • https://eurouniversal.eu/ckfinder/userfiles/files/47943826537.pdfIn PDF document text
    • https://gulamanis.com/contents/files/riwawiwojij.pdfIn PDF document text
    • https://khotelmarket.com/FileData/ckfinder/files/20210912_747C637D684A9439.pdfIn PDF document text
    • https://vadihosting.com/calisma2/files/uploads/nekuboda.pdfIn PDF document text
    • http://stonepigments.com/userfiles/file/xonisekexitugizipitetox.pdfIn PDF document text
    • https://dom4m.com/userfiles/files/19028610106.pdfIn PDF document text
    • http://gpsputhuppally.com/userfiles/file/repabefo.pdfIn PDF document text
    • http://sunwisechem.com/Uploadfiles/files/tomosevufupusiv.pdfIn PDF document text
    • https://thietbixaydungcantho.com/canthomobile2/public/images/sanpham/files/89922753551.pdfIn PDF document text
    • http://www.wcd.com.tw/ezadmin/ckfinder/userfiles/files/kiliraximutafori.pdfIn PDF document text
    • https://ezastupitelstvo.sk/editor_uploads/system/files/rototofilepunajadi.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/16144ab341823c---josefatovewavitimopel.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613468ec903c8---sawuva.pdfIn PDF document text
    • http://psychologadamczak.pl/userfiles/file/85326792342.pdfIn PDF document text
    • https://illustrations.noche.fr/images/files/zixepewolofo.pdfIn PDF document text
    • http://hdurmuslar.com/images_upload/files/79682096732.pdfIn PDF document text
    • http://nattuvaartha.com/assets/ckfinder/core/connector/php/uploads/files/xokafodapuno.pdfIn PDF document text
    • http://mauthietkedep.info/upload/files/32059967089.pdfIn PDF document text
    • https://florissantdesign.nl/docs/Image/file/memunebusoxalujo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=wallpapers+for+phone+androidPDF 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_off0000b385.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB385 10488 bytes
SHA-256: b15e4f072409ac4728c3aab1c734f19af3503cd0db56e03148cf3e9aeacb7c38
font_01_sfnt_off0000cb3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB3D 14896 bytes
SHA-256: 113319d2dfe0c73612a384459e7086db62e3a4245e7be7daaaab75e6a994c727
font_02_sfnt_off0000f0fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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