Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a435ad48ab9dd06…

MALICIOUS

PDF

71.3 KB Created: 2021-09-25 10:16:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: ed86f5504e7440b16b8df3487b47dae9 SHA-1: f9a5371706843c6f5696b0577be9eda9e9c64b89 SHA-256: 9a435ad48ab9dd06723ba218d91f4b23222ecb6be116295bac8a419f8e90321d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs and links to compromised WordPress sites, suggesting it's used to redirect users to malicious content. The PDF structure and embedded links indicate a phishing or malware distribution attempt, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://medvor.ru/uplcv?utm_term=android+handy+mit+smart+tv+verbinden PDF link annotation
    • http://thuexedanang247.com/uploads/image/files/wadow.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/161421812c5474---venerarore.pdfIn PDF document text
    • https://trisyscom.com/userfiles/file/20242221506.pdfIn PDF document text
    • https://bi-kiesabbau.de/cmsimple/images/file/95537149492.pdfIn PDF document text
    • http://vyveva.eu/UserFiles/File/kegitavopemifegum.pdfIn PDF document text
    • https://regiefranchet.fr/userfiles/files/48654334094.pdfIn PDF document text
    • http://good163.cn/Uploadfiles/files/79160360179.pdfIn PDF document text
    • http://thanuyentea.com/ckfinder/userfiles/files/5036417808.pdfIn PDF document text
    • https://eastmangroupllc.net/ckfinder/userfiles/files/dowik.pdfIn PDF document text
    • http://revistaspontan.ro/assets/ckfinder/core/connector/php/uploads/files/95232785929.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/9ff673208879d3f19eae76741f3005fc/xobolutatofozejovukekus.pdfIn PDF document text
    • https://brs.jo/userfiles/files/33307803717.pdfIn PDF document text
    • https://dalycity.com/wysiwygfiles/file/tefibenid.pdfIn PDF document text
    • https://ppkh.net/userfiles/file/77818450446.pdfIn PDF document text
    • http://laptopplus.be/app/webroot/files/userfiles/files/96281032592.pdfIn PDF document text
    • https://nghiepvu.udicmanpower.vn/uploads/news_file/36551879335.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/46095404248.pdfIn PDF document text
    • https://cafesca.info/ckfinder/userfiles/files/63020247535.pdfIn PDF document text
    • http://celcg.pl/uploaded/file/buzulegagifatit.pdfIn PDF document text
    • http://scales-center.com/shop/fck_file/file/fekuxit.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/161448ec9204d4---44857383374.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/3fb2cb849ddf0cfd0b70fa0097dbaa12/baduxonodilobixufopakozaz.pdfIn PDF document text
    • http://ros-audit.com/i/up/file/mapifewizede.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16132e2816e7b2---77440710068.pdfIn PDF document text
    • http://ageddfjtj.pretty-match.com/upload/files/70519366911.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_off0000b320.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB320 17092 bytes
SHA-256: 1b0eed681ad9223481f98ddf3f30946d24b998dbca05193e6babd0346d8143c9
font_01_sfnt_off0000de63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE63 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f67a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF67A 10768 bytes
SHA-256: bff26b20c77e951f7336cb89fa35a34a8bebdd8ba303389dc93341945aea5d8c

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