Malicious PDF — malware analysis report

Static analysis result for SHA-256 419fc32cadf68cd3…

MALICIOUS

PDF

73.0 KB Created: 2021-09-03 00:56:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 84ee79236c02727e733a3c42c946e5fe SHA-1: 81f6f45a580fec456c1d14475be8761f900c035e SHA-256: 419fc32cadf68cd3403eaed24057b950e6058af0b8017156dfbe439a4632cb6d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this. No scripts were extracted, but the primary attack vector appears to be directing users to external, potentially malicious, URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160826e201de8b---76156619525.pdf In PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/8bfbe4209a7974ca1977b8e7c6d056e1/vuxedoxasuk.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/333cc40b8209237c28a33e634950acc4/89422936300.pdfIn PDF document text
    • https://ive-cal.it/file/13692355715.pdfIn PDF document text
    • http://sdds.be/userfiles/file/jutilopoxigap.pdfIn PDF document text
    • http://yanartekstil.com/firma/files/53670574417.pdfIn PDF document text
    • https://bititechnika.com/uploads/file/moxugam.pdfIn PDF document text
    • http://imssp.by/data/images/fxeditor/file/88080633701.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a787a4a95ee---58068585950.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607375d796b7a---lijekelaxiziv.pdfIn PDF document text
    • http://rapet.hu/files/81801606377.pdfIn PDF document text
    • https://hanedantoptan.com/upload/files/68568423582.pdfIn PDF document text
    • https://uleshuzataruhaz.hu/files/file/26936612027.pdfIn PDF document text
    • http://newtarrytowndeli.com/uploads/files/zadogivugagokenogetagabot.pdfIn PDF document text
    • https://o2opr.co/userfiles/files/firifagi.pdfIn PDF document text
    • https://thefertilizerproductionline.com/d/files/50549774802.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/7va8u7u1ag7asrc5svhl2aktf0/lijifudevefefuwow.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/a6013ae3b8ceb02f3ca0df317a78fc49/xetaz.pdfIn PDF document text
    • https://www.kasekimi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca6755b132---feteruxejezabiw.pdfIn PDF document text
    • https://chokysitohang.com/Uploads/userfiles/files/jefalepizusaxupudogobef.pdfIn PDF document text
    • http://gptools.net/userfiles/file/25385038317.pdfIn PDF document text
    • http://degrossier.nl/uploads/file/79426717425.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/1606efffc1acd1---mawuniwomusokikewek.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=cahier+des+clauses+techniques+particuli%C3%A8res+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_off0000b992.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB992 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d1a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1A9 11028 bytes
SHA-256: eaab72187fefb4a7c8d1fbcdce3e2860d8b4553843ededc1566df656ca76dd22
font_02_sfnt_off0000eaba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEABA 16312 bytes
SHA-256: 13860f34cb251f04549d037b9ae272477c10b1fcac0dffaede5f7704d6bbbc82

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