Malicious PDF — malware analysis report

Static analysis result for SHA-256 48168b083dd8807d…

MALICIOUS

PDF

83.9 KB Created: 2021-09-05 06:58:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 51022492b00beb7ab7735ecf3f93dd0f SHA-1: 0235bec532928ebf7452f0f1aece93f0615f9601 SHA-256: 48168b083dd8807d1f1d504dd35e6753dee27a3d31ef834d44677c9f92cc70d8
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories, indicating a link farm or SEO spamming attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or hosting malware. The presence of external URIs and link farms points towards an attempt to direct users to malicious or compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160d1b4e5596af---69089655193.pdf In PDF document text
    • http://effekt-film.de/files/file/89343107788.pdfIn PDF document text
    • http://obrienbuilders.com/userfiles/file/voxadobezewif.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/gexurawavejilis.pdfIn PDF document text
    • https://libertyrealestate.in/ckfinder/userfiles/files/kebitona.pdfIn PDF document text
    • http://grandchainfamilyfoundation.org/clients/85333/File/jinivamuvefaxakomuxoti.pdfIn PDF document text
    • https://textosolutionslinguistiques.ca/upload/editor/file/61704312426.pdfIn PDF document text
    • http://morard-mcf.fr/data/Files/zogamobetufulikadaxem.pdfIn PDF document text
    • https://hoangphatdanang.com/uploads/image/files/74898227748.pdfIn PDF document text
    • https://contact-house.com/fckeditor/upload/file/dobememaxo.pdfIn PDF document text
    • http://www.haztartasigepszakuzlet.hu/pics/file/diderojevagifigoziretobit.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/b62e5e758e2c87e5323115974f81da5f/26831041170.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a6f2dae553c---86461615920.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f18c72753d78cf73d16f8debefa94a44/97699701838.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16099fdec5079c---16795738018.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/29trqc8ctsnk6f611i2gpa2q12/fonulipuxijunowusejoj.pdfIn PDF document text
    • https://tiemhoamo.com/data/dulieu/files/fefomojeronimarepem.pdfIn PDF document text
    • http://vpecargo.com/userfiles/file/3370578919.pdfIn PDF document text
    • https://angkalaris.com/contents//files/gofugixilotu.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/87cf9ca897033630427c052e2c38aaea/tebudexezer.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160b5cf99b51cf---rupemusovitekaxi.pdfIn PDF document text
    • http://studiozammuner.eu/userfiles/files/kujazirelitewap.pdfIn PDF document text
    • https://ibeguiristain.com/userfiles/files/86646799855.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f70ff25e1e---tojimiwojubelemuwulo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=the+official+guide+for+gmat+review+2017+pdf+freePDF 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_off0000df68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF68 11356 bytes
SHA-256: 0bf9b8fa6224d953714fc4dfcbd8140ec9515ea71ce39eeff11db17cbdbf60a9
font_01_sfnt_off0000fa24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA24 18384 bytes
SHA-256: c835f745866cf068be2a91bd7c60fb3a27607abaf2622edcef0bee367b46d171
font_02_sfnt_off000129d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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