Malicious PDF — malware analysis report

Static analysis result for SHA-256 6792ab5c8b788595…

MALICIOUS

PDF

94.9 KB Created: 2021-09-01 16:13:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8061d0f7f5e7e077d0daeecc7d774228 SHA-1: 0dcb38fd4db98188dd6f983e95e33e35e37f7850 SHA-256: 6792ab5c8b788595059e12bd8283a683107f2df7b786a4c0181c2ee1918e3195
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to potentially compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs, while some are benign, are part of a larger pattern of directing users to external sites, likely to host malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160717a5a746af---58674730957.pdf In PDF document text
    • https://hanyauntuktesting.com/contents//files/baxufogekodepuzebiz.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/14586395894.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/96t91oab71php506fb6sio09a3/timelofada.pdfIn PDF document text
    • http://mnogonomerov.ru/uploads/file/45641773407.pdfIn PDF document text
    • http://babyindex.nl/images/uploads/95390183656.pdfIn PDF document text
    • http://nsdadventist.org/FCKData/file/wexirep.pdfIn PDF document text
    • http://beijingteye.com/upload/files/papavezupewewuviw.pdfIn PDF document text
    • http://ville-dammarie.com/ckfinder/userfiles/files/82984379714.pdfIn PDF document text
    • http://solyaris.pro/admin/ckfinder/userfiles/files/fuzevukejin.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/fb9qe7kpqpt4l0kfn1gosdem09/86251006951.pdfIn PDF document text
    • http://zaragozalawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zeromolokezuvubukuduja.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ef01875d30---nigetoburogipub.pdfIn PDF document text
    • https://okinawa4d.com/contents//files/ruroguwotoj.pdfIn PDF document text
    • http://www.travelwithtaangoo.com/img/file/sesuwewitivirojamek.pdfIn PDF document text
    • http://ikhmongol.mn/ckfinder/userfiles/files/lilikozixade.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074752dcb1e5---78350949377.pdfIn PDF document text
    • http://galluccifaibano.com/userfiles/file/xupuge.pdfIn PDF document text
    • https://al-farh-iq.com/upload/userfiles/file/8712584052.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/160bae5811104c---36028670440.pdfIn PDF document text
    • http://zkojicin.cz/userfiles/file/kodirewasawogusife.pdfIn PDF document text
    • http://amphorabeautyclub.com/campannas/file/42316954483.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16085181e1009e---24185839582.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160f4ebb670a1b---rajimodoweborutedun.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=the+sound+of+silence+guitar+tab+pdfPDF 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_off00010d96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D96 17840 bytes
SHA-256: d1716a11c8013a9dc6fee8637a268ca2b8dd5c5646391a7c0d3dcb0588b7b388
font_01_sfnt_off00013c1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C1B 11104 bytes
SHA-256: cd47a54aeca5c0b4a405fbb0583f8e9f78559e4a423a92047360d8e1df9f52b4
font_02_sfnt_off0001557f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1557F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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