Malicious PDF — malware analysis report

Static analysis result for SHA-256 9052a2512a24609f…

MALICIOUS

PDF

88.8 KB Created: 2021-07-24 18:10:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 88106ac9c82dc75d99d6dfc61c48eebf SHA-1: dab262122bef640a17b8837c02037756d23722c9 SHA-256: 9052a2512a24609fa3d79dfc83810df67c90ee2cf07c3827bf22ba5b0c0f16b8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The embedded URLs and the heuristic firings indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160832858d7670---51464260747.pdf In PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4010170287---wikat.pdfIn PDF document text
    • http://ccforum.kr/uploads/file/1621809942.pdfIn PDF document text
    • http://tokyoracing.hu/userfiles/file/nebotedaxij.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d60c376cb8---wuripegobakasepozimoxog.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/812197b1c03673da0ad95cd8dba49d99/molewejefikatuzolo.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608c8b5d58376---62850805639.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/s5non9bb89vo9up9fe57mr50ps/78098959797.pdfIn PDF document text
    • http://mehmetrasimmutlu.com/icerik/file/61089422711.pdfIn PDF document text
    • http://4bx.pl/public/file/2545085555.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-6-5/20210605194529259408.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/f0b897d2cf8a6f5b9aeffbdabda192af/gesegokijobenajesag.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/7uug416sn5f554j4ac94b67ec6/laruzetevuwesuterazoza.pdfIn PDF document text
    • http://ardechetendancebrut.fr/userfiles/ardechetendancebrut.fr/file/gawanuxavezuzozubomufaza.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/1e1826869fb507d3c047ac667ee857ea/vovufitopa.pdfIn PDF document text
    • http://thesnowmanicecream.com/ckfinder/userfiles/files/temitulepisawofiko.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16087435a99092---kazozetiweredatozoxen.pdfIn PDF document text
    • http://aliglobshop.com/userfiles/file/51941106960.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/qh4j2s5136am0hr98jmur7bfb6/xilekugujutonesigilebi.pdfIn PDF document text
    • http://jkohut.pl/file/kesumav.pdfIn PDF document text
    • http://beulahcooleycollection.com/clients/870349/File/45855712186.pdfIn PDF document text
    • https://couvreur-hautdoubs.fr/internet_new/images_et_fichiers//file/82237353357.pdfIn PDF document text
    • http://cropscipublisher.com/files/upfiles/file/nisamegafuzisebujida.pdfIn PDF document text
    • https://aduanaldelvalle.mx/userfiles/file/zawemovavatomop.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=how+to+download+music+from+itunes+store+for+free+on+pcPDF 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_off0000f755.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF755 16628 bytes
SHA-256: 0f88edc0fb26ad978f126e946a02632033b1b4d84bb990ff5d7a1ba34430afd2
font_01_sfnt_off0001226a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1226A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013a81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A81 10956 bytes
SHA-256: 8cf1fdbe69a1198826c10e0897c5cbae5756248343782842a731c34666dfcf99