Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c87fe74bd268a4a…

MALICIOUS

PDF

92.7 KB Created: 2021-08-13 16:07:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3497ca8072e47a414b832489f4c0bbd5 SHA-1: b96e3939bd3dacf22920587259d841233dcf6c5f SHA-256: 5c87fe74bd268a4ae111d3724c0f92f980d48772c7a69a4ba806184033913b85
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It functions as a link farm, presenting numerous URLs that lead to external websites, some of which are hosted on compromised content management systems or disposable domains. This pattern suggests the PDF is used to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://huntic.ru/uplcv?utm_term=can+you+stop+a+microwave+from+beeping PDF link annotation
    • http://joyear.com/ckfinder/userfiles/files/majanosoboluneregoraj.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608252b42bf94---rijexaremeromupolujisux.pdfIn PDF document text
    • https://ms01bet.com/contents//files/vuxebifapo.pdfIn PDF document text
    • http://essuances.com/ckfinder/userfiles/files/wojafavovanepexagibu.pdfIn PDF document text
    • https://www.swissfillon.com/wp-content/plugins/super-forms/uploads/php/files/a4ce4d19f52f704fa076a61458286a17/mavij.pdfIn PDF document text
    • http://medicaldistri.com/ckfinder_files/files/remawisuwebugabekoturu.pdfIn PDF document text
    • http://rheinmotel.com/userfiles/file/88486124741.pdfIn PDF document text
    • http://dokturmice.com/ckfinder/userfiles/files/64162958619.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16073d4c696012---wulazononufifigego.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/113c829fee23afccee1d06bedbe74b86/fiboje.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/cfb1959d3a3b3abc49ae2cf351e87496/darilokudoripuno.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607119681a18e---fowekufotufegobolove.pdfIn PDF document text
    • http://gelateriacool.it/userfiles/files/22127525346.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161030b47856b2---pejiroxipuwunaxoxuko.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608fbc9f04f8b---xusitefozunasesakubenibe.pdfIn PDF document text
    • http://litho-and-co.fr/ckeditor/upload/files/20946423576.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/07ltotdi5sudjg2r111i2kiv9e/26602876359.pdfIn PDF document text
    • http://hk-sai.com/ckfinder/userfiles/files/xibumugoxubiwexeb.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/271006db5299caf1b3eabcb937838721/vejolizolatopaxifipoxo.pdfIn PDF document text
    • https://traiteur-troyes-mariage-buffet-aube-10.blaisot-traiteur.fr/ckfinder/userfiles/files/78066483803.pdfIn PDF document text
    • https://avonsteel.com/UserFiles/file/88014607465.pdfIn PDF document text
    • http://puginternational.com/ckfinder/userfiles/files/solosifemozonitefevoziba.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/ubjtkds86ald89rk193ik2koih/lisetijagibejan.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/137c697cb8c8caccd32d25f635365472/wekas.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1607dd37b7777b---86578745084.pdfIn PDF document text
    • 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_off000104cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011cdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CDF 17328 bytes
SHA-256: 4c89c7bc21a69146a79cbc9d0868f179020ce97c39fdf1c3d39d5bdda7a142cd
font_02_sfnt_off000149fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149FB 11312 bytes
SHA-256: e37eda3afe86acaefeca10339e28206107d8ae5b61745fee28cc9155ff7a1d59

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