Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef987f1adb92bbf7…

MALICIOUS

PDF

75.0 KB Created: 2021-09-01 09:06:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 188ae6f96e2c6a7235eb7e2d68070cc7 SHA-1: 1bde64899327059987f35615f8db1c529533a974 SHA-256: ef987f1adb92bbf7a2f51ca71431814c744085227a64a3eb34ecefed509bed40
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to compromised CMS uploads, likely to distribute further malware or phishing content. The presence of multiple external URIs and link farm heuristics strongly suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609473b60b410---23681060048.pdf In PDF document text
    • https://centrobrands.com/wp-content/plugins/super-forms/uploads/php/files/8fc762c602e755a6905ada1fba7acb09/vajetifevazetixapilifif.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/83987e67a7abfe987fe8975c77d95e80/jenovujerikepelotasa.pdfIn PDF document text
    • http://2021woods.com/clients/b/b0/b0e6999751250b7f6f06d89f33415bdd/File/logoduniragoxuf.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/mvhf27rlrr0f27uep4q27tg8ej/72151306953.pdfIn PDF document text
    • http://balmybnb.com/t/tutorfirm/uploads/ck/files/popef.pdfIn PDF document text
    • https://serviceelectric.ca/userfiles/file/gaxanovoda.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b41fe0be8e---95597618114.pdfIn PDF document text
    • https://bouwservicewinthagen.nl/userfiles/image/file/32774087460.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/d6889891e04c3b8c8035f4756c59b2e6/weporidejamugikuvijotit.pdfIn PDF document text
    • https://menu2uplus.com/images/file/ditufir.pdfIn PDF document text
    • http://recrute.fr/files/files/fedelelizogodivefimim.pdfIn PDF document text
    • https://www.ideaklinikbursa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bab1bcd917---26881585107.pdfIn PDF document text
    • http://tasarimak.com/ckfinder/userfiles/files/85804033455.pdfIn PDF document text
    • http://perilatomsk.ru/ckfinder/userfiles/files/27911603618.pdfIn PDF document text
    • http://smwiarus.pl/ckfinder/userfiles/files/5352245053.pdfIn PDF document text
    • https://aprilboya.com/userfiles/file/79633877932.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/5795a796b053c9738aa1b701537ea432/mularotirumulerekabukepe.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/16099063e233e8---xutojowivanofuwezi.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160833a2373341---81407219005.pdfIn PDF document text
    • http://alpha-cp.com/userfiles/file/19559958546.pdfIn PDF document text
    • https://www.erenang.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087a85352770---4331541920.pdfIn PDF document text
    • https://cakesandcupcakes.net/userfiles/files/27392474205.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/edrkllfmg9t2mcipns1chllfij/ponibafunumom.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=hell+holes+nature+trailsPDF 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_off0000c28e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC28E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000daa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAA0 17288 bytes
SHA-256: e115266e71f9924ca1ddd0783e1a76f177d7fe7f042cb1609dd12cfe5d17c71b
font_02_sfnt_off00010770.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10770 10296 bytes
SHA-256: 85b63c6b4fddbd77cd859164f7fdb060b0cd83c090fca18b2d6e0fcf4a8c10e6

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