Malicious PDF — malware analysis report

Static analysis result for SHA-256 8101f47bfe3a7138…

MALICIOUS

PDF

92.0 KB Created: 2021-07-26 07:02:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 7128079419ccb17830c78b83535abd63 SHA-1: b1ab238eab53b6f3d3073b585527396b480e8cc5 SHA-256: 8101f47bfe3a7138aa2adbd7e6d78aa1c392ed4ac11898f8ad7da9e6cb740470
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm pointing to numerous compromised WordPress sites, indicating a phishing or malware distribution attempt. ClamAV and ML classifiers strongly suggest malicious intent, classifying it as a phishing trojan. The presence of multiple external URIs and link farms suggests an effort to obscure the ultimate destination and potentially host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160825a4808388---mudaveda.pdf In PDF document text
    • https://jerseyshorepirates.com/userfiles/files/84537007076.pdfIn PDF document text
    • http://seamacros.com/upload/file/xajawejamurawegipike.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c50a90597fa---valobekukimikup.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/uvhe7pifr7t3orbp5v6ks3b196/82174848986.pdfIn PDF document text
    • http://lhs1965.com/clients/880801/File/lufajimezevagudomufa.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c21e313337f---97201859390.pdfIn PDF document text
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/525de0ea94cc069bf3e71d584546034d/joludawiveradu.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a5ce74786cd---niwugujefusov.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/5iv0ghrj3roc6ukldh7v8h00b5/badedomaluzexumuja.pdfIn PDF document text
    • https://trouver-une-ssii.com/img/pics/files/53411133986.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be3c8b1e289---95941224185.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/cf2ac8a7af2800a9845effb11d34bf0d/20094604325.pdfIn PDF document text
    • https://mimpiindahsatu.com/contents//files/jodonis.pdfIn PDF document text
    • http://hollandunitedreunion.com/clients/5/52/52f3fdf721cdccceb566e47094f1d9de/File/kitumamefuduxitexewusi.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/ab8e99aa0bb394e1c6b404810083f76a/gamipigebe.pdfIn PDF document text
    • http://kondicionery-domodedovo.ru/upload_picture/file/rividexikirisute.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/0c5dd0adaf97f8b17227b57520c9b76c/47918075649.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/414848fa18d15a2087792d4769e98fa9/1151198349.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/19a27b0ceb67ad99c248c2f769776e30/65571276254.pdfIn PDF document text
    • https://drsubhashawale.com/ckfinder/userfiles/files/53112625239.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/1606f61806d9c5---5069636770.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=can+you+download+fortnite+on+ps4+500gbPDF 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_off0000fdfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDFB 17940 bytes
SHA-256: 6c6dbed5ec29b8a303536342a7a4f2e700c2a08b7e828c26bc62078639f0886f
font_01_sfnt_off00012d55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D55 11476 bytes
SHA-256: 76eb739596453faec62069031838fd092eb0dba859f230070c78890beb71387d
font_02_sfnt_off00014858.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14858 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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