Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fb3c10077142ffe…

MALICIOUS

PDF

92.7 KB Created: 2021-08-01 15:01:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0e23700132bd9c0889ec9ab058585475 SHA-1: 698ee4730caacfd3d888ad8f3029c13ac0c64fb7 SHA-256: 5fb3c10077142ffef8d3ef407e022ae2f3a1ea63b2ac723c870b9ba6abbb90c2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a phishing or link farm strategy. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://inwebjor.ru/uplcv?utm_term=how+much+exercise+to+lose+weight+with+pcos
    • http://klpa.net/userData/board/file/kasifinerorak.pdf
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dca1a82213d---2268171072.pdf
    • http://instant-image.net/UserFiles/Site/File/38137078154.pdf
    • http://donateagift.eu/userfiles/file/rubid.pdf
    • http://youandisagenix.com/ckfinder/userfiles/files/wukamufowofilivetujex.pdf
    • https://vanvoorst.info/uploaded/file/vonizovojorofokinim.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099e2e249697---futodulomisofurepukibekil.pdf
    • https://slaterlighting.com/wp-content/plugins/super-forms/uploads/php/files/bcbfe1639d03dbed1b996c6d60aa9ab5/worurogisilowa.pdf
    • https://nasikampung.info/contents//files/43345990944.pdf
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160815c93115cd---28529372321.pdf
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dc4720839e---52498589781.pdf
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e2fd4679130---nobafimotixukasolofagof.pdf
    • http://zae.me/datafiles/file/wipepodonekuwoseluxefo.pdf
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608679528422c---vupamipabadeduxezasajopu.pdf
    • http://textingrights.com/userfiles/files/55362795168.pdf
    • http://studiolauramoschini.it/userfiles/files/40406538900.pdf
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a32d2a4f50e---kulerisagefa.pdf
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160aafa7323009---80135735304.pdf
    • http://rockghs1965.com/clients/8/8c/8c68d0bbb6adb8fad5f76254a0516489/File/kutebosowowitupa.pdf
    • https://hosvagyok.hu/userfiles/file/lidosibuferawajeka.pdf
    • https://lederstuhlshop.de/ckfinder/userfiles/files/73295936549.pdf
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/vikvijubsn1c1g7p4ve8qemig2/ragen.pdf
    • https://www.apollopowersystems.com/wp-content/plugins/super-forms/uploads/php/files/8d36eeb27949c1312c8a17740d365afb/nixukedejomirobofur.pdf
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3291bd1d1a---82812415417.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010679.bin
94025fbe89ca6d42d838904e2c7a8eb0e416ff801899f8822a1bcbecbc68aea9
pdf-font-stream PDF embedded font (sfnt) at offset 0x10679 17128 bytes
font_01_sfnt_off000132e9.bin
901b05eefee7f4a1cb185e87f05d7eada9c8a7cc625da42fbf7fdb17dbea42dc
pdf-font-stream PDF embedded font (sfnt) at offset 0x132E9 10836 bytes
font_02_sfnt_off00014bfd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14BFD 16792 bytes