Malicious PDF — malware analysis report

Static analysis result for SHA-256 33196ead16c058d3…

MALICIOUS

PDF

88.2 KB Created: 2021-09-08 01:28:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 55606a145205553af6f240a8272809bd SHA-1: 7a116b46203c68e80439de2638e62cea9756177f SHA-256: 33196ead16c058d37d6cf318a08ad213a6be496a78c90874b7f185564e96f324
156 Risk Score

Malware Insights

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

This PDF was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains a link farm with numerous URLs pointing to disposable hosting and compromised CMS upload storage. The primary purpose appears to be directing users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://nesthomes.in/userfiles/file/zuraxuwunup.pdf In PDF document text
    • http://doks-films.com/pcms/content/file/30279317390.pdfIn PDF document text
    • http://www.anjhimayath.com/upload/file/14795434681.pdfIn PDF document text
    • https://navliecky.net/userfiles/file/8865651406.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a31d41580bd---11591403556.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d39348a3bc---melapajo.pdfIn PDF document text
    • http://studioingtassinari.eu/userfiles/files/viwalavokawogepuzijigoted.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160887e4dcdced---46532203500.pdfIn PDF document text
    • http://griesvoegwerken.nl/UserFiles/file/8000004598.pdfIn PDF document text
    • http://phdpecs.hu/userfiles/files/14131179600.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c88c795acde---2659874102.pdfIn PDF document text
    • http://starsunited.at/upload/files/doputapapawafel.pdfIn PDF document text
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/i5asd3aucmkhftuicbnheseghf/tibepetolofusogevoluvebi.pdfIn PDF document text
    • http://www.cpnatacao.pt/backoffice/ckfinder/userfiles/files/tugopokenujilurafokurubog.pdfIn PDF document text
    • https://hotelmitrutarija.com/uploaded/files/39201180672.pdfIn PDF document text
    • http://wirtrauenuns.ch/images/file/nalipowinamiri.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/62610750474.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bca01c9f3d5---zuvadofifitalurululedapas.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160a23d82ce2d8---doxumusibanobezakoga.pdfIn PDF document text
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160843f21113d0---zatiditakonobozivexev.pdfIn PDF document text
    • http://diacritic.org/travel/app/webroot/img/files/32555357589.pdfIn PDF document text
    • https://iqrainternationalschool.org/_assets/files/gixudoketisulurakopulim.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/de1e49006fba93be4fd353cfa6842a35/66132221044.pdfIn PDF document text
    • https://charteriraq.ir/basefile/charteriraqir/files/20904493754.pdfIn PDF document text
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/16086c3babf821---24367663448.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=asset+swap+pricing+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_off0000eec4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEC4 10696 bytes
SHA-256: 6041391ebbe9cb94c132c77c4bbe6648767b928fc53df3b3362faef2945a80d7
font_01_sfnt_off00010752.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10752 19512 bytes
SHA-256: 52f84591b000b8678de19ab44b33658a8eace901a40c8390d69a6d85fe09408c
font_02_sfnt_off00013b09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B09 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1