Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2bf7514a0e04dbe…

MALICIOUS

PDF

78.1 KB Created: 2021-09-06 05:44:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 668d2b4f27d9128ab93c07fca6b1c841 SHA-1: 6219b53741c12d473c3daf2fca73aac5e826de18 SHA-256: f2bf7514a0e04dbe812114cd05b28fd9bc0ec5ff2e7f57a99d5c83f277a12706
96 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to domains flagged as link farms or hosted on compromised CMS uploads. The ML classifier strongly indicated maliciousness. While no scripts were extracted, the structure suggests a malicious document designed to redirect users to other potentially harmful content, possibly as part of a phishing or SEO poisoning campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 5

  • 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://papierplus.pl/userfiles/file/tidoxakefaburesiwiz.pdf In PDF document text
    • https://www.prshots.com/ckfinder/userfiles/files/80038053309.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160912e6562b61---fenuxapuzekekeno.pdfIn PDF document text
    • http://dailymaydemtien.com/userfiles/files/56770535279.pdfIn PDF document text
    • http://c2r-auto.com/uploadfiles/file/2021052619464173499.pdfIn PDF document text
    • https://machnhaduong.com/images/uploads/files/48279144551.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/021956124302.pdfIn PDF document text
    • http://lifemartrealestateconnect.com/wp-content/plugins/super-forms/uploads/php/files/216thii22a1vqqv57toi81tg53/lupukisuxivagekomuparuj.pdfIn PDF document text
    • https://geneolock.com/locktactyuma/userfiles/file/nawediwarazibexivo.pdfIn PDF document text
    • http://carneslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sofonorefodugimonuxil.pdfIn PDF document text
    • http://bdn10.cz/files/file/24643132754.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/1606f531ae2955---45567964878.pdfIn PDF document text
    • http://maslatalaia.com/userfiles/file/ridomuzenojamup.pdfIn PDF document text
    • https://alshaabcoop.com/userfiles/file/10629719607.pdfIn PDF document text
    • https://baongochoa.com/upload/file/87341127242.pdfIn PDF document text
    • http://meyanko.com/userfiles/file///78586367438.pdfIn PDF document text
    • http://www.motorradfreunde-toggenburg.ch/up/files/rukugidabamalazaluxesewin.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16100b4b36bebe---diwilezizigisefumiladu.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/1gk6eqjdpk5jmo795r4ms86kej/zirokozuwajolu.pdfIn PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/3tt13nr9n181cds00c2jelao42/rovegixamesagoxalinidira.pdfIn PDF document text
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/472368cdbcd81c2a4147a0f4c1c49b27/35704227236.pdfIn PDF document text
    • http://aodaiminhhanh.com/app/webroot/uploads/files/dokuxinefezebuzuka.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/597f0571352b273757cff88418899efc/37551822850.pdfIn PDF document text
    • https://remoteworkerclub.com/wp-content/plugins/super-forms/uploads/php/files/d4700f8611967e40b9ce887a3a325c89/dajuta.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=pharmacy+refresher+course+2018+pdfPDF 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_off0000cb1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB1F 17404 bytes
SHA-256: cf65b4b7427be1c447c96064651910c9fdcfd5459453555f373576b72fe2980c
font_01_sfnt_off0000f86e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF86E 11264 bytes
SHA-256: 1b18d3f03df405205643908f6ea0e6de35d043a038f427fa21e98aefe001d1aa
font_02_sfnt_off000112f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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