Malicious PDF — malware analysis report

Static analysis result for SHA-256 94208bf98dcf4199…

MALICIOUS

PDF

85.8 KB Created: 2021-09-02 05:54:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 4d3bb69248ad59c5d70151ce10437ddf SHA-1: 29c4de6fbf0c4b42d71e9371c32e18e5aac5fc49 SHA-256: 94208bf98dcf4199c019a0cece6761072eee7ac2d874a212fed97fa367641c12
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a phishing or trojan threat. The document functions as a link farm, with numerous embedded URLs pointing to external sites, some of which are hosted on compromised WordPress installations. The primary attack pattern involves luring users to click these links, likely leading to further malicious content or exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://opuspointpartners.com/ckfinder/userfiles/files/jufopuxibotiluwixotunasi.pdf In PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/k925rl950e2tu8noaglc4u3t2f/nelusoxudowozo.pdfIn PDF document text
    • https://feltshoe.com/userfiles/file/muditaxunejitezotivas.pdfIn PDF document text
    • http://hevolta.com/upload/file/87012067962.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/13992291496.pdfIn PDF document text
    • http://gospelpour100voix.com/fichiers/newsletter/file/wunenaniz.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/e98060d26acef3a127c5a9f34e7e4fb6/99966251758.pdfIn PDF document text
    • https://webmenuplus.com/images/file/25036335208.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607d98a0e77b8---85548703987.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/5f93993b92366789b528707e8971f030/38459760064.pdfIn PDF document text
    • https://meesens.be/KrMee/Tekstverwerker/kijixovexokizazevijita.pdfIn PDF document text
    • http://qzgj.cn/upload/file/82745681225.pdfIn PDF document text
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080840585b6d---22957567611.pdfIn PDF document text
    • http://kbchina.de/upload/vugegotofukevakafikejoku.pdfIn PDF document text
    • https://www.medicalbi.com/ckfinder/userfiles/files/fixuv.pdfIn PDF document text
    • http://wu-pao.com/upfiles/editor/files/76547872813.pdfIn PDF document text
    • https://keyseries.us/userfiles/file/majarekupejal.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16077252b4fbdb---37661528.pdfIn PDF document text
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/8lppk1se7g5p1qetgulfb8fns5/diboxedobaxitu.pdfIn PDF document text
    • https://dancleland.com/img/upload/file/65575509464.pdfIn PDF document text
    • https://thefertilizerequipment.com/d/files/jelanefilawesos.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/160a05636d2ae2---25269390528.pdfIn PDF document text
    • http://beastyenergy.com/userfiles/file/57884595283.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/fedcea5f038fe3682ad0a2c0a936315b/befiwutalerosobawe.pdfIn PDF document text
    • https://brillimet.com/uploads/files/202108152135402332.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b05b5485349---847913576.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=the+specific+gravity+of+water+is+maximum+atPDF 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_off0000e562.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE562 11208 bytes
SHA-256: 99060ec2c8aab7613381ba13d0c04191a92b1e440f0b2615ba511e67af118e1d
font_01_sfnt_off0000ffcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFCF 18524 bytes
SHA-256: 8ffbd73b4bc1e0ed5d5d920fa95f16e85457fcfd3c04b8f10da12c15c485e34f
font_02_sfnt_off0001304a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1304A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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