Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff382128cf661717…

MALICIOUS

PDF

90.1 KB Created: 2021-09-02 12:51:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 5f84350d882e915c7d77a369bfda0daf SHA-1: 1ad9f0a1227468a1f935b46ec6931e6daae330c9 SHA-256: ff382128cf661717fa030eb1621e8301b5d3b33e9a9e708bcfb98bb384da03ad
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 external URIs, many pointing to compromised WordPress upload directories, suggesting a link farm designed to distribute malicious content. The document body is heavily obfuscated, preventing analysis of its direct content, but the overall structure and URL patterns indicate a phishing or malware distribution attempt.

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://pixomot.ru/uplcv?utm_term=una+grammatica+italiana+per+tutti+2+pdf+free+download PDF link annotation
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/dbe42324537c33393479d8faf74d5e2c/zopumud.pdfIn PDF document text
    • http://daiichilogistics.com/uploads/news_file/xulituzukigom.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f018e8d9ac5---73174554005.pdfIn PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/28b096d0dc1b6b99640b0364ef220d60/93278778167.pdfIn PDF document text
    • https://apz-arte.com/ckfinder/userfiles/files/2504628217.pdfIn PDF document text
    • https://xlspandoek.nl/userfiles/file/89471671057.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/1nqe5v45evt8vu890ei5t1ln00/pufax.pdfIn PDF document text
    • http://newgatedesign.com/Images_upload/files/66769894176.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f49045b2c1---12749899381.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/306a206bede0fd795a8fae129b412e74/39518030234.pdfIn PDF document text
    • https://metnar.pl/web/uploads/files/6858156007.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/8ada7f2ccd7e32dd2474c9448144fc6a/57999980586.pdfIn PDF document text
    • http://clinicaveterinariailmarzocco.it/userfiles/files/lurowogeritabenovamovat.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/160868d24d0695---66453082710.pdfIn PDF document text
    • https://www.prestigeautobody.com.au/wp-content/plugins/super-forms/uploads/php/files/932d1a445c96c820a3d1c70bd8440988/wufezux.pdfIn PDF document text
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/3f8645ce9ca4e074231f107ac89b52f9/wufibot.pdfIn PDF document text
    • http://cherishedmomentphotos.com/clients/8/84/84fe84b553acfcd191e166b7401b6f02/File/leteduxubikigosik.pdfIn PDF document text
    • http://fitnessklub-impuls.pl/uploads/assets/file/zakevozirip.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16093a236d2b1a---ravoxewadinomisimuvabe.pdfIn PDF document text
    • https://wanna-drive.nl/files/File/gizojupuvojatawo.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/nujumanovo.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8c897edcf---sixugosivodawimeriwipak.pdfIn PDF document text
    • http://intranet.uts.edu.co/portal/app/ckfinder/userfiles/files/99552801117.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/zefuguzamajeped.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_off0000f475.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF475 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010c87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C87 19236 bytes
SHA-256: a33dfcea624d37d014752cd5e8eab693bab42cdcebe8503b11be8fe549e91d22
font_02_sfnt_off00013ff1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FF1 11108 bytes
SHA-256: fe36ed445207bf51d33cb5fbd5ce436c6aaa26df65c756b7b99118e7bb1b5f96

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