Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b1c075d0a8792dc…

MALICIOUS

PDF

87.8 KB Created: 2021-08-05 16:16:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3798d0074dd90a0b4fe5e8ea6c3a964a SHA-1: cad91681e2e9824c9cfa84faa78f5546a8385018 SHA-256: 1b1c075d0a8792dc72a1bc39b3bce154ff48c31e9cd8f1d0e2914678633fca8b
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to numerous external websites, some hosted on compromised CMS platforms or disposable domains. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure and URL distribution strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 https://ptogel2.com/contents//files/lewir.pdf In PDF document text
    • https://marblo.com/app/webroot/img/files/zepaxagivariretaja.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/1c1bf5sg8rgo1ujtjnsl5gqc52/kulaxunanolagedu.pdfIn PDF document text
    • http://go-pxl.com/uploads/files/3412821680.pdfIn PDF document text
    • http://archi1919.com/smlclub-files/file/zalakanomineboliw.pdfIn PDF document text
    • https://pepinieramontana.ro/ckfinder/userfiles/files/73865097045.pdfIn PDF document text
    • http://verdantnorwich.com/clients/3/30/306756bb587dffcd11ca74610d845a16/File/ponanin.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160cc6a9ddc26e---kitafikunudarada.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e8dee61043---fesakesusuwikunelurawap.pdfIn PDF document text
    • http://npi-management.org/ressource/site-image/files/memodov.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160aaf730b3904---48638374762.pdfIn PDF document text
    • http://classtool.info/upload/files/wonotozasobuniwanibewi.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/160adf018d33b5---lusasomipuzibeloki.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/1a8fd3d62b7870dd33b6fe3150268bbd/relarapojabevo.pdfIn PDF document text
    • http://n-production.com/upload/fckeditor/file/91464882852.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1d5c8ce51d---35310476784.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160edf7946d6ef---6729316488.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a725771449f---86707530713.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c821ca7fa9---18433519627.pdfIn PDF document text
    • https://infrastone.com/userfiles/files/17987869274.pdfIn PDF document text
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/4fd0c94ff323ca7b75c5613959e06f74/pekamatagimizurawipebano.pdfIn PDF document text
    • https://grupo-bahia-real-estate.com/ckfinder/userfiles/files/14895567691.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=zulubet+correct+score+prediction+for+tomorrowPDF 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_off0000f21e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF21E 10908 bytes
SHA-256: b170e21cc563a39825800fb807b95a117c9fddff23c320cbb114ba6d789a72e3
font_01_sfnt_off00010b34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B34 17692 bytes
SHA-256: ebb2549cd48d5b4c5b1869caf59c8b743fdc5f47fefec55103a9571a5dea2a3f
font_02_sfnt_off00013990.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13990 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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