Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5baff808354a26e…

MALICIOUS

PDF

85.3 KB Created: 2021-09-03 21:48:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 8d83925d8f351f597616a508a1dcf835 SHA-1: 72e5bff30aa40c7f8f4629ff2b45963a42c4356e SHA-256: f5baff808354a26e6fb9e671ec2a1006a5ee40112f4da863afe18bd9c876a9b1
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress upload directories, indicating a link farm designed to direct users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or SEO spam.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://echipamente-scule.ro/userfiles/file/jegebodoba.pdf In PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/08638c50e4b500ae69a43b9df6da8df0/zipunodavokizawazowugaf.pdfIn PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/naq7timn4vvag0hibb0fctm2fk/dexuwat.pdfIn PDF document text
    • https://tabularasa.lv/sites/tabularasa/uploads/documents/files/52865239886.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/2nts789ndfvj9cqomfe4cujd78/gafalusesi.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/bf87a53d23d9318414911ae8a749296d/69189104214.pdfIn PDF document text
    • https://xn--80aanugxqi.xn--p1ai/admin/ckfinder/userfiles/files/7461528622.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/160bad501dc0c2---zanikadozariwewe.pdfIn PDF document text
    • http://srihemkuntsahibfgp.org/hemkunt/userfiles/file/95356841581.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a449d2b92bd---motixowesazefivipaxukala.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/5c4cbe6b758d58c6f5c9caeef1cf880d/tevakugatel.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160818e87098db---48068221608.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c5acd7bb0aa---90545990232.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f602ec9e3f---zozodaxolesijanix.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c952606f5f---lujuxatuko.pdfIn PDF document text
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b4a34404f67---febiwegemidimibagaguseno.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/7ecfd2d54aa2f760bc8917fef394b384/zogodojulo.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607b2a86a66b2---fixikufurofime.pdfIn PDF document text
    • http://www.halpellet.hu/userfiles/files/nebujilebirosa.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2d140effff---penekuzevakoganijo.pdfIn PDF document text
    • http://weighlessthisyear.com/ckfinder/userfiles/files/laponerigej.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/160871aa3180b9---dowenipiletikojer.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/s606c7lib746d0he6ivkm0l764/wupidosakenumefenozeno.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160785ceb79799---libepolimulaxuti.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=2016+challenger+hellcat+manualPDF 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_off0000e6cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6CC 10760 bytes
SHA-256: 3139365d1f4390eaea54c564989960dd25e8593c855850d1f1dfea1f25e889c8
font_01_sfnt_off0000ff7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF7D 18328 bytes
SHA-256: 2765ceff056efdfa59732a5b99732adb835b27a7eb68717443d1ffa505e43e2a
font_02_sfnt_off00012f57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F57 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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