Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2a78d4ea9ccdf4e…

MALICIOUS

PDF

79.6 KB Created: 2021-09-14 13:28:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ffe74b2f264dc5ce7fa1b509f7eca4a1 SHA-1: 87bf8fcfc7c05f517e95fa66c03d89827254818b SHA-256: a2a78d4ea9ccdf4e3d4fc1a138d8958c36def241bc4cc0a7005a46434cbf9ee6
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress uploads and other disposable hosting, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The embedded URLs are the primary indicators of compromise, facilitating redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://drafthe.ru/uplcv?utm_term=tired+red+eyes PDF link annotation
    • https://inprovitchile.com/ckfinder/userfiles/files/46793721972.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/cf08cbc00619d895422faecf07e97ce5/68237306477.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/161396fb6a6533---79831508136.pdfIn PDF document text
    • http://capesociety.ca/uploads/files/12673892841.pdfIn PDF document text
    • http://dianacb.cz/userfiles/file/lulevim.pdfIn PDF document text
    • https://studybrilliant.online/app/webroot/img/userfiles/file/jugibilabolufara.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138c8fe0681d---ziwuworirewosobekemem.pdfIn PDF document text
    • http://oxigensupplies.com/shipinc/userfiles/files/ponamexufeno.pdfIn PDF document text
    • https://muacash.com/webroot/img/files/20199571481.pdfIn PDF document text
    • http://annamsaigonlaw.com/upload/files/85008253203.pdfIn PDF document text
    • http://dezis.ru/uploads/files/tejilezuropazigujopojot.pdfIn PDF document text
    • http://geometrabottero.it/userfiles/files/61698163208.pdfIn PDF document text
    • https://traffictkt.com/viking1/uploads/files/paxusagijixi.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/579cd8639cb7095139fe4f5a93ba3615/lutege.pdfIn PDF document text
    • http://website-design-company.in/dev3/damodar/ckfinder/core/connector/php/userfiles/files/mifabod.pdfIn PDF document text
    • http://standardamulet.com/files/files/fijusena.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/ac65f6d70994436f43941a3ca2880e3d/xiluwexixipaxugufefan.pdfIn PDF document text
    • https://karlholmbygg.se/UserFiles/files/98105890454.pdfIn PDF document text
    • https://champion-osk.pl/userfiles/file/rirori.pdfIn PDF document text
    • http://vetusmeter.com/images/upload/File/14538213384.pdfIn PDF document text
    • http://phannhan.vn/files/usersfiles/files/44852094249.pdfIn PDF document text
    • https://lenaoyunlar.net/calisma2/files/uploads/soribumexuj.pdfIn PDF document text
    • 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_off0000d725.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD725 17328 bytes
SHA-256: 71bddaa9da8810f1dafd951c477e47b2f726a437cde192f428b81c94ba43b020
font_01_sfnt_off000103ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C02 9788 bytes
SHA-256: 520a378493e425ff867d81fe2dcfb19f3ed18060866e0d173cdb18041187d7e8