Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa042b8733e222d2…

MALICIOUS

PDF

85.3 KB Created: 2021-09-04 20:31:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 102ad539e99234bb373c78db470f3515 SHA-1: 65ea8e7bd27a8e8243d2a96864b1bf3ab4d6115c SHA-256: aa042b8733e222d2dadf7645cc071935bd2e06679b4253ab96e5b7c0d03ffaf4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains a link farm pointing to numerous domains, many of which appear to be compromised WordPress sites or disposable hosting, suggesting an attempt to distribute malicious content or phish users. The presence of embedded URLs and the overall structure indicate a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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=public+radiation+protection+pdf PDF link annotation
    • http://bluebiz.kr/userData/board/file/1811482845.pdfIn PDF document text
    • https://bangprice.com/bangprice.com/beta/cms_image/file/95485250933.pdfIn PDF document text
    • http://selmanoglusigorta.com/userfiles/file/87030597523.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b85f7564f7a---14811505534.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a423e921a1a---4179845447.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608e19e66179f---kafukeridubadabaxawijela.pdfIn PDF document text
    • http://teleinwestor.com/userfiles/file/99771521235.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607f720fc6b2b---42146640057.pdfIn PDF document text
    • https://ooo-kenk.ru/userfiles/file/32515414121.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b95e033eaa---9190255383.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609fe86932159---vabitedegufija.pdfIn PDF document text
    • http://zap-interactive.com/uploads/files/89756817546.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/a1286b3095fc251432cd2413ae1ba1b7/benofomotobo.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/7c1ecef00e22551c3b3a79a7af065b57/porugukoxugoxilumavejibi.pdfIn PDF document text
    • https://maintogelonline.info/contents/files/52109700908.pdfIn PDF document text
    • http://puzynowska-kancelaria.com/userfiles/file/7051435128.pdfIn PDF document text
    • http://atallmed.com/userfiles/files/71716756440.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6c5c19b7f5---mafaver.pdfIn PDF document text
    • https://bancodevida.com/bancodevida/admin/images/image/file/nufudixetebot.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c4dd4491224---62265405391.pdfIn PDF document text
    • http://dentistturkey.com/image/files/87772583914.pdfIn PDF document text
    • http://quiltingacademy.info/fckeditor/userfiles/file/41582906487.pdfIn PDF document text
    • http://ambcavallon.eu/userfiles/files/6051204125.pdfIn PDF document text
    • http://eprdel.cz/userfiles/file/rutoriwigumipobamugunu.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_off0000e8ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000100c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100C0 17920 bytes
SHA-256: b02bfebdfc44327b861e60492c90fafe097a917065beec2f6071fa6c33ff0072
font_02_sfnt_off00012f11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F11 10684 bytes
SHA-256: b272e4f70347be47847db4895ad0ecb185a6ce4e68d1e39369f7742ed2f738b8