Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fc99d72292f4cc7…

MALICIOUS

PDF

72.4 KB Created: 2021-09-06 16:04:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 6d056899a379993ae9f87f27762b4e2b SHA-1: 443a9b8c92f57d180a3b65274a2f30293ddaa026 SHA-256: 7fc99d72292f4cc76de5efd7c0d97e3b14d74fbced6de9821801b47b5acd06d7
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple potentially compromised or disposable domains. The document body is unreadable, but the presence of numerous URLs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest a phishing or malicious redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://dissanna.com/temp/fckeditor/file/78624606606.pdf In PDF document text
    • http://mavelikaradiocese.org/rapha/ckfinder/userfiles/files/nonatisemadimuxuxol.pdfIn PDF document text
    • https://delphin-bau.com/ckfinder/upload/files/mugirum.pdfIn PDF document text
    • https://piataafacerilor.ro/app/webroot/files/userfiles/files/jekomi.pdfIn PDF document text
    • http://aftckwt.com/uploads/file/gusetodetuxiwirifu.pdfIn PDF document text
    • https://soalmatematik.com/userfiles/file/67848369833.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607682c85eb73---8816974493.pdfIn PDF document text
    • http://biblioteka-belzec.pl/upload/files/buxulusizufe.pdfIn PDF document text
    • http://mirutte.com/newsfiles/files/40603284638.pdfIn PDF document text
    • http://probeg2000.ru/files/userfiles/files/xorif.pdfIn PDF document text
    • http://cbestdesign.com/ckfinder/images_store/files/tavadudufi.pdfIn PDF document text
    • http://yuemeism.com/uploadfiles/files/67421080460.pdfIn PDF document text
    • http://hotdeals24x7.com/ci/userfiles/files/xebetopokinixomodorejop.pdfIn PDF document text
    • https://gerastar.com/userfiles/file/jasulijukefu.pdfIn PDF document text
    • http://www.aluvascientific.com/UserFiles/file/31879976936.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096d8d395458---fepoxufuf.pdfIn PDF document text
    • http://phutungotodungha.com/img/files/lebojutizukuz.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b62363d36d---xowalajupipuj.pdfIn PDF document text
    • http://maciejabramowicz.pl/upload/files/file/suxoxanadaxe.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a26d682fada---zanuwebikonajubovanafaru.pdfIn PDF document text
    • https://jxloanchien.com/style/postimage/file/99271383753.pdfIn PDF document text
    • http://abacusnancy.com/userfiles/file/rizifet.pdfIn PDF document text
    • http://essuances.com/ckfinder/userfiles/files/wojafavovanepexagibu.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a10843c7cc---sexaxofipawaweponim.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=audacity+manual+recoveryPDF 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_off0000ba0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA0C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d21e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD21E 16212 bytes
SHA-256: f2507c3cd8df17183d028ab83663aa5fafa045fa507587549f8c2074f2e83306
font_02_sfnt_off0000fc38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC38 10624 bytes
SHA-256: 6915f4f5e06f0453f8351a8a29f064996ea5fc6ce628ba73f3df427caf1978f1

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