Malicious PDF — malware analysis report

Static analysis result for SHA-256 f92be8a5e736a6dd…

MALICIOUS

PDF

70.0 KB Created: 2021-08-26 00:46:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: eb14a044d2c640507a46af362d3e3004 SHA-1: b68d697efe58ae7dba5904465667489d47118664 SHA-256: f92be8a5e736a6dde0cd7e4b7d4f3695e7ff797cb859f15ae6a9116eef789882
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains a link farm with numerous URLs pointing to potentially compromised WordPress sites and other disposable hosting. The primary purpose appears to be redirecting users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/5abd76d1443aa8b93b76f89c1bfcc079/zidapujavexudegiw.pdf In PDF document text
    • http://baschin-heizung.com/meineBilderAlbertGrundschule/file/bolopowora.pdfIn PDF document text
    • http://otvorene-srdce.sk/userfiles/file/zudodanufa.pdfIn PDF document text
    • http://brandweeramsterdamamstellanden.nl/userfiles/file/68648117204.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/bfbf4f346c4de8d2bf1c950921d4b41b/38413865336.pdfIn PDF document text
    • http://cheumst.com/upload/fckeditor/file/buvupokobasemawu.pdfIn PDF document text
    • http://xedaptheduc.net/app/webroot/uploads/files/8961001170.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082437bb6588---vuvemetek.pdfIn PDF document text
    • http://10glazsikeyrosa.ru/file/23724328136.pdfIn PDF document text
    • http://sbox-technology.com/upload/datoteke/vawesudegoludo.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072f0d481b6e---jilovagalovanaxawikij.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/ae4656f78a050e6fe8ed017472e0fea5/jowegibasivisevuk.pdfIn PDF document text
    • https://audit-advisers.com/userfiles/file/89577573758.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1611764fb3969c---jinavojoredobunonip.pdfIn PDF document text
    • https://jkmart.net/FCKFiles/File/3280659122.pdfIn PDF document text
    • http://parfumland.sk/upl/91685561876.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087593bbe478---19857481192.pdfIn PDF document text
    • http://geriatriccarenewjersey.com/userfiles/files/lumugemaja.pdfIn PDF document text
    • http://webinaris.net/ckfinder/userfiles/publics/files/66140416084.pdfIn PDF document text
    • http://asremajazi.com/uploads/files/44385820145.pdfIn PDF document text
    • http://srihemkuntschoolint.com/slbdavbatala/userfiles/file/pikufojuguwu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=angular+material+time+pickerPDF 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_off0000af92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF92 10604 bytes
SHA-256: 845a85db4ef6f547b4d007335a8cd9a0cc699edacbcbba3f915949b97de411d6
font_01_sfnt_off0000c7d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000dfe4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFE4 16564 bytes
SHA-256: 0f3694b36f496b68d2966f2747036f14bd2877520218ccd90ce786d28ac6a14a