Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc991d2b8f5eb5bb…

MALICIOUS

PDF

127.5 KB Created: 2021-07-01 16:18:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 914513cf9794164f767e2686d8060c1a SHA-1: 1016cf755a2b0e1c9005532639fd823aed3f2d01 SHA-256: cc991d2b8f5eb5bb231ffa1f30dc6b01cac6939ea0e73dfb1fd0e1e867cf5ea9
156 Risk Score

Malware Insights

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

The sample is a PDF document identified as malicious by ML classifiers and ClamAV. It contains numerous links to external websites, many hosted on compromised WordPress installations or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of multiple PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics indicates a strong intent to distribute or phish via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://irlanc.ru/uplcv?utm_term=sample+questions+and+answers PDF link annotation
    • http://posekatzahradu.cz/files/file/1001925106.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083d17e090cf---54970708812.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d5c4b854cb---62061987745.pdfIn PDF document text
    • https://amd-export.com/site/upload/file/napexet.pdfIn PDF document text
    • http://www.haztartasigepszakuzlet.hu/pics/file/34932728215.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160ab65d8efac0---55119049282.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/4rq8he7pbmp162llajfbeknfc1/gopimawomisimevotubileg.pdfIn PDF document text
    • http://drairtools.com/ckfinder/userfiles/files/39671747060.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609fe84dee7d2---27894379152.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/160c922a03fa19---10760596013.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5b02ac636---napamitalamid.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/fdade03caab111832797bb5ba23a1905/10440696606.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/cd1c96fa0b104d0a9a0af915eaca6faf/dimelajixofop.pdfIn PDF document text
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/qigvv5i188pvq8itcfdousvgd2/70457981902.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/475622afd97f709bb4e520dc7f964b2e/89294674869.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c65069e8007---jepesi.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/3484d1e989ef615360553df5e0a3ff98/xuzugebowoj.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/5c35a27caed336deb4d5b106f770bcfc/wetakufibuteborupebipezuz.pdfIn PDF document text
    • https://anmimar.com/royal/userfiles/file/muvozosibedo.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a40b7b7c82e---28483940195.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/wusowagoxusibewo.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cba59ee008---ramut.pdfIn PDF document text
    • https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/8351a555caab27d8630ec790905371b6/28538837593.pdfIn PDF document text
    • http://minerva-collection.net/files/files/nilisim.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_off00019180.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19180 10960 bytes
SHA-256: 5b29e0844f9d29a3cea3f8338881f80ab74f3bff223e8d6f340bcc1291fe0486
font_01_sfnt_off0001aaad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AAAD 17636 bytes
SHA-256: 8f7166d3a7f63fe2aee6eae40420eceaba1c47b8316a878123807656f73407d2
font_02_sfnt_off0001d875.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D875 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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