Malicious PDF — malware analysis report

Static analysis result for SHA-256 83ad636517845f40…

MALICIOUS

PDF

72.0 KB Created: 2021-09-29 10:31:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 96de77b6d2c8cbcfdb0cbfe20350fc53 SHA-1: 449e1633d369c420d2152d8c217f3e18c12f02d5 SHA-256: 83ad636517845f400e45f502d90e94fb34e2bfb3ed8b17d5e1636aee4c6b5cd6
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 link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9902

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://yulintimber.cn/d/files/sorov.pdf In PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/161486f5820490---710620812.pdfIn PDF document text
    • https://yingzhaoliuart.com/upload/file/63630881600.pdfIn PDF document text
    • http://dryoucosmeceutical.com/userfiles/files/nafafutejis.pdfIn PDF document text
    • http://noithatlekhanh.com/Images_upload/files/finojeno.pdfIn PDF document text
    • https://www.sacict.or.th/ckfinder/userfiles/files/92122422477.pdfIn PDF document text
    • http://hyundai-baoloc.com/luutru/files/jagevo.pdfIn PDF document text
    • https://monographie.com/ckfinder/userfiles/files/19182309503.pdfIn PDF document text
    • http://k12kos.com/ckfinder/userfiles/files/58805614113.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/1472216794.pdfIn PDF document text
    • http://huichem.com/ckfinder/userfiles/files/soromupizone.pdfIn PDF document text
    • http://nataliashishkina.com/userfiles/file/zitaxariwuvinivu.pdfIn PDF document text
    • http://dongamold.com/fckeditor/upload_files/file/11966439887.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1615170660bb4b---sofisoni.pdfIn PDF document text
    • https://kovrdom.ru/sites/all/sites/default/files/file/watidulisaserar.pdfIn PDF document text
    • https://nayyaralidada.net/alpha/ckfinder/userfiles/files/lavizenasabideg.pdfIn PDF document text
    • https://weldingportal.it/userfiles/file/45180888450.pdfIn PDF document text
    • https://giorgiosantinelli.it/file/mirajapo.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/us4st9natvm37mlp3vpqrpco0a/remadebodikamex.pdfIn PDF document text
    • https://fotografski-studio.kost.si/userfiles/file/77838018896.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/57fff6b641ac230db9f34ee76bd90981/5644598114.pdfIn PDF document text
    • https://letajicikoberce.cz/userfiles/file/35411454281.pdfIn PDF document text
    • https://tourgardan.com/basefile/tourgardancom/files/73447368633.pdfIn PDF document text
    • https://nstoplana.rs/ckfinder/userfiles/files/xegawotomeguzopozamuxa.pdfIn PDF document text
    • https://nuttydog.hu/ckfinder/userfiles/files/40806716148.pdfIn PDF document text
    • http://gamulchi.org/userfiles/file/rumijudafilibi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=nicomachean+ethics+bekker+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_off0000b69c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB69C 11048 bytes
SHA-256: ed51d6298ef4001bffdd753e5e694d40bf22cfc7f2edf517884c6b2083b939ef
font_01_sfnt_off0000cff1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFF1 16540 bytes
SHA-256: faa0d75e1eb5c6c5dab838db97089c02a91d27d0d23ef038cacf4b44b65f9aa4
font_02_sfnt_off0000fa09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA09 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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