Malicious PDF — malware analysis report

Static analysis result for SHA-256 75c0a42530198570…

MALICIOUS

PDF

83.6 KB Created: 2021-09-09 23:20:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 403c7045c5599e1f8d94718888d311dc SHA-1: 923e351dbd2f8790d2ab51d0817a29e23ac14b9b SHA-256: 75c0a42530198570917763c7a3c3ee68cad0b422b778586a1eec2c8e77e79290
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to disposable hosting and compromised CMS upload directories, indicating a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics suggest it is likely part of a phishing campaign, potentially using embedded JavaScript to facilitate redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://diarch.in/WYSIWYGImage/file/18045961562.pdf In PDF document text
    • https://leonardscopysystems.com/home/leonards/public_html/ckfinder/userfiles/files/gunukelimuvogorog.pdfIn PDF document text
    • https://gestionarival.com/userfiles/file/64515557985.pdfIn PDF document text
    • http://malagi.pl/user-files/fck/file/kipotavamuxalonivenato.pdfIn PDF document text
    • http://matchonusa.com/uploads/files/regobomed.pdfIn PDF document text
    • https://fotoprint.lv/downloads/file/42475676865.pdfIn PDF document text
    • http://chemsdano.com/upload/files/55900896938.pdfIn PDF document text
    • https://goldgreiner.de/userfiles/file/88371179193.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/161391cfcc41c3---58998706265.pdfIn PDF document text
    • http://epoptavky.com/is/images/FCKeditor/File/zajixavo.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f4bf6d4188---poraxamopisanovosumem.pdfIn PDF document text
    • https://fototipia.hu/files/files/nufamuwowebugexusus.pdfIn PDF document text
    • https://cliniquemyo.com/userfiles/file/suwusomilixezekafexe.pdfIn PDF document text
    • https://robindayne.com/ckfinder/userfiles/files/21488971818.pdfIn PDF document text
    • http://winterwonderlandzundert.nl/uploadimages/files/82770056144.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/37557915173.pdfIn PDF document text
    • http://rent2day.ca/ci2/userfiles/files/bofelisebumojajup.pdfIn PDF document text
    • https://caror.hu/ckfinder/userfiles/files/wirowusutepulolenibog.pdfIn PDF document text
    • http://usatovl.ru/upload/fckeditorfile/25227748532.pdfIn PDF document text
    • http://infosierra.es/images/editor/levipodonewozopotip.pdfIn PDF document text
    • http://www.valaisconsulting.ch/file/fojitesurifoza.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/161319f6c8551b---buletun.pdfIn PDF document text
    • http://celesteandtorsten.wedding/images/file/97559468555.pdfIn PDF document text
    • http://odumakus.com/uploads/files/zusiwovebumof.pdfIn PDF document text
    • http://eviljoy.com/UserFiles/File/penexuwutedukid.pdfIn PDF document text
    • http://mikailang.net/userfiles/file/20210906231138_415752528.pdfIn PDF document text
    • http://alituncer.com/userfiles/file/6277517442.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=bollywood+movies+online+with+english+subtitlesPDF 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_off0000e3d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fbe8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBE8 10992 bytes
SHA-256: 0903897c38caf5a6f6635d5262acfdb2816ebbe652823314a80daf4efa7ceda1
font_02_sfnt_off00011517.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11517 16664 bytes
SHA-256: 3006eefb58d4e54f44765f18d4baee553822e2b9cc7b1bf879d26e6624a2e3af

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