Malicious PDF — malware analysis report

Static analysis result for SHA-256 f35d973b1338088c…

MALICIOUS

PDF

100.7 KB Created: 2021-07-14 00:42:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: f13793824617fc019967352779e88edf SHA-1: 543a6455b74383610a19d0d012e44e1169c2341e SHA-256: f35d973b1338088c24f6697bcaf7f6cccc658ed6561b97f4d1ab99204e3fe062
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV. It contains a link farm pointing to multiple domains, many of which appear to be compromised CMS uploads or disposable hosting. The primary purpose seems to be directing users to potentially malicious content hosted on these sites, which is a common tactic for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9938

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://easyreturn.store/userfiles/file/wizutabosof.pdf In PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/1608ea758805ca---30211639859.pdfIn PDF document text
    • https://mayurherbal.com/userfiles/file/59489072905.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/aho54uguigv82dh6dhm1vtpro1/buwexenizidaruz.pdfIn PDF document text
    • http://kowel.com/ckfinder/userfiles/files/1622295699.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/62e996a65a5a7d62c4e22dd632423db3/82858344770.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607613269a6f7---85819495125.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160d67576567ba---75369350735.pdfIn PDF document text
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/0b09e84399df0f74d22e0eec3ff24840/ximoruzikexope.pdfIn PDF document text
    • http://tiendanatacion.com/noticias/files/29060840574.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/a206c398b94127abe9a96adc9d97c852/gaxuxaranuketewabufe.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16085cbcb2e7c9---79088192892.pdfIn PDF document text
    • http://easternhoteljeju.com/FileData/ckfinder/files/20210619_A466C7459F502847.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160891743d018f---kexumazafesejaxoj.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/5ae2d28e9918eca04a6f10dc5bc943ce/10322970722.pdfIn PDF document text
    • http://bagiez.de/userfiles/file/zipewofopuvobuluvidofo.pdfIn PDF document text
    • https://artasedanasingaraja.com/uploadfck/file/76393493057.pdfIn PDF document text
    • https://eprobatdz.com/ckfinder/userfiles/files/14931641495.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/73338609090.pdfIn PDF document text
    • http://leadershipcareer.kr/fckeditor/_upload/file/tizum.pdfIn PDF document text
    • https://foulardfotografando.it/file/jatiwolu.pdfIn PDF document text
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f2b64653d3---2843083428.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160e8cf4559846---58453660020.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=the+very+hungry+caterpillar+songPDF 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_off00012687.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12687 10896 bytes
SHA-256: 7db0521411b223ea0ac07446ddf0e59631f009b8cd72eeefd52fb5cf66948cdb
font_01_sfnt_off00013fbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FBC 17372 bytes
SHA-256: 20320137344c844de14c5467d1ff424c10775b2238ed1e2df4f601a10075f6c1
font_02_sfnt_off00016d55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16D55 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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