Malicious PDF — malware analysis report

Static analysis result for SHA-256 56572f42ab40e909…

MALICIOUS

PDF

86.6 KB Created: 2021-09-07 02:07:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 009a3caade35ef7a0272283b70b578b4 SHA-1: 18e5bec1980cb4081dfad924ce2936ad0b86b357 SHA-256: 56572f42ab40e9098d6851f769637fc538e1618403dd170222dc248b20e78e2c
156 Risk Score

Malware Insights

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

The sample was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics indicate the PDF contains a link farm pointing to compromised WordPress upload storage and disposable hosting, suggesting a phishing or malware distribution lure. The document body is unreadable, but the presence of numerous unknown URLs strongly supports a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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 https://assignmentmart.com/ckfinder/userfiles/files/tixodebepubijujomexam.pdf In PDF document text
    • http://dolphinkorea.com/files/files/vitakedujij.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c62a259bab---rirojakutemofoxo.pdfIn PDF document text
    • http://gialtour.it/themes/userfiles//files/xenofo.pdfIn PDF document text
    • https://motoralbini.it/files/file/gorofuropepek.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/161032503c593d---didigesafalebofipuboke.pdfIn PDF document text
    • http://akvari-um.ru/userfiles/file/14643485851.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/73c8543fe67e527ff3b5edab0e28d7a8/87505062997.pdfIn PDF document text
    • http://pro-group.ru/userfiles/file/1651282849.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/qqde1lnmi5q0sdp8kh5r9cgh1g/vezosodunudekesum.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c41a5f5cc7c---gowufopud.pdfIn PDF document text
    • https://knurussian.kr/DATA/upload/files/202108101801228988.pdfIn PDF document text
    • https://goldenlinejsc.com/userfiles/file/67547318441.pdfIn PDF document text
    • http://niezapominajkowo.eu/userfiles/file/sorarik.pdfIn PDF document text
    • https://divanich96.ru/admin/ckfinder/userfiles/files/92020921457.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/be929db48f0629573844fe0b22880b92/watevedimorenigepubepaz.pdfIn PDF document text
    • https://helices-evra.com/userfiles/file/91438255889.pdfIn PDF document text
    • https://organicfertilizerproduction.com/d/files/61613273625.pdfIn PDF document text
    • http://zezoalza.com/ckupload/files/nubufagujawomatuxuxujifo.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606fcbdab0ae9---wibisago.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e665504fb2---pafobajutejiw.pdfIn PDF document text
    • http://homokkepek.hu/editor_up/jofig.pdfIn PDF document text
    • https://www.bramfordgc.co.uk/ckfinder/userfiles/files/47832331425.pdfIn PDF document text
    • http://angelescare.com/userfiles/file/miremoger.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608a5e8d33037---8652692918.pdfIn PDF document text
    • http://arci-mp.fr/admin/File/28626746674.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612385f342e43---jofewanulijaf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=ieee+standard+for+ethernet+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_off0000f015.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF015 10408 bytes
SHA-256: 9f852233e72e179cb3a17f7bbbfa91b304080a0a75a3b05fa0d994068ac2f212
font_01_sfnt_off00010798.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10798 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011faa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FAA 17308 bytes
SHA-256: 916d9026812ff6b65355b8f0b965ddeaf3270b00dac8cbb705a6d99e6d978fb6