Malicious PDF — malware analysis report

Static analysis result for SHA-256 922b4994526b955a…

MALICIOUS

PDF

83.3 KB Created: 2021-09-01 20:00:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ef444fc63687efac069a10ba7f4d2ca6 SHA-1: a648812dbcafbed222035631f757af2f49d7a7d6 SHA-256: 922b4994526b955a06cefabe29e861d56080fe0f5d69880cb9ffdcffdeae0596
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Numerous embedded URLs point to various domains, many of which appear to be part of a link farm hosted on disposable or compromised infrastructure, suggesting an attempt to lure users to malicious sites. The document's structure and the nature of the URLs indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://inhome360.ru/admin/ckfinder/userfiles/files/34014272040.pdf In PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f09f540be2b---20925581349.pdfIn PDF document text
    • http://ufnk.fr/app/webroot/files/file/beziba.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/e9c1gp1c0hktojffqkpc3enr87/tuxarutenebodoleguv.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/womaxasivelobaxeposedudem.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160afcf2932a09---72930690986.pdfIn PDF document text
    • http://tamker.hu/userfiles/file/fesesesiturigixa.pdfIn PDF document text
    • https://martas.vodrsport.cz/uploads/files/90797820173.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/donjqihqchbkdi2h0edo3a422d/55662688758.pdfIn PDF document text
    • http://costruzionibulagna.it/userfiles/files/66988525267.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/ff7c8183e3ce724f2a5056729dd3f8ca/tidud.pdfIn PDF document text
    • https://oilbasaro.com/web/images/ckfinder/files/20210613200243.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa2a23cb93---dudinemejoseminaniko.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d260f83942---garive.pdfIn PDF document text
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/d868c76ce468a37b5b9296a1c00543ef/15069280183.pdfIn PDF document text
    • https://minlinart.com/archive/upload/files/99218661232.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b60cc084205---vezarufesareranatidawewo.pdfIn PDF document text
    • http://carszana.com/image/upload/File/ruxigine.pdfIn PDF document text
    • https://0286869143.com/editor_images/files/wotumalinogeritegum.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160d77d4335f62---kuvobofawusesigepu.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f55cfc458c5---95645641909.pdfIn PDF document text
    • https://davaocarrental.com/images/file/38849067641.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612365ccb8561---43971732286.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077a2150fb4c---komerufaginozevofune.pdfIn PDF document text
    • http://vienhung.com/webroot/img/files/1136277312.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=one+direction+ultimate+quizPDF 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_off0000e04b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE04B 10692 bytes
SHA-256: 258f2a8edce6a7828a66314db7750ffa108394346a117075dba66c59beed8d84
font_01_sfnt_off0000f8a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000110b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110B3 17976 bytes
SHA-256: e8cc2b3af633bb6934070942a4acbb109d0ead3c4d56af9d62424dc6706fb705

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