Malicious PDF — malware analysis report

Static analysis result for SHA-256 b05e0d283fc8fa62…

MALICIOUS

PDF

93.1 KB Created: 2021-08-16 08:58:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c6dda0a27fd2c1fe9122e314da6738df SHA-1: 0bf34e00a990006d5f99bcf625652e571de919c0 SHA-256: b05e0d283fc8fa62694f3cfe7a58b2f1212abb6dc7b700029ae0aa447cc391f0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to compromised websites and link farms, suggesting a phishing or malware distribution campaign. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this by identifying a link farm on disposable hosting, commonly used to obscure malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

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://crysiq.ru/uplcv?utm_term=1-99+smithing+guide+osrs+fastest PDF link annotation
    • http://trhs1966.com/clients/b/bb/bbabdd843433c1cf4d3e80624837507c/File/letet.pdfIn PDF document text
    • http://nhs1980alumni.com/clients/878257/File/tigepiruz.pdfIn PDF document text
    • http://tangiahoang.vn/Images_upload/files/nadosibovemuzalo.pdfIn PDF document text
    • http://seyrimerdin.com/userfiles/file/komekakawesaxexalejorali.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a8473213070---88068025428.pdfIn PDF document text
    • https://poolpoint.be/uploads/file/kebufotirolelolekezud.pdfIn PDF document text
    • http://avsa.org/sites/default/files/images/files/28036673538.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/a86c3624397786f4d9b2ae258dffa2db/jasote.pdfIn PDF document text
    • http://ackerviewguesthouse.com/userfiles/file/xowepurodipetajudiwojip.pdfIn PDF document text
    • https://alajuusa.eemedia/contents/file/994641607.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606dce1822733---39227269835.pdfIn PDF document text
    • https://rajatotogroup2.com/contents//files/filepifobelodonitob.pdfIn PDF document text
    • http://dental1970.com/clients/5/52/52cfbc2c58cc98a1938bca6351e90795/File/xadoduwibab.pdfIn PDF document text
    • http://sntaviator.ru/ckfinder/userfiles/files/kizokusufumupibirafagez.pdfIn PDF document text
    • http://studiomalpocher.it/userfiles/files/kemowi.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4b375498ec---xalanomanevekaduziwave.pdfIn PDF document text
    • http://pwr-tech.ru/userfiles/file/57803865858.pdfIn PDF document text
    • http://braciszewska-klimek.pl/fck_files/file/kametumakosep.pdfIn PDF document text
    • http://lagunaapartman.hu/images/user/file/86742940646.pdfIn PDF document text
    • http://say-international.eu/userfiles/file/weviloroxavimiveka.pdfIn PDF document text
    • https://baigiangtoanhoc.com/upload/files/50443811113.pdfIn PDF document text
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/368ce4bb43d3e80ffe0a581439de3966/49262073118.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/f8fce07076ac69fb305e920b79d42900/taxivatuf.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16118b9c3efc00---finuzizefajosiw.pdfIn PDF document text
    • http://baikalspring.ru/ckfinder/userfiles/files/fiwalebumewilesagomem.pdfIn PDF document text
    • http://xn--49s538bo8ux8c.net/userfiles/file/zejobabolitaginojatabu.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_off00010662.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10662 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011e79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E79 11012 bytes
SHA-256: bc9efeafa21792de449517003a9e100876d0bc6dfd39a67a53af3daabe02db0f
font_02_sfnt_off000137ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137BA 16888 bytes
SHA-256: c8c0cf79ae65aed84b87731ed32e2388280c834c9d961d7678e8df2c81f75600