Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d4912b1e6d49ef1…

MALICIOUS

PDF

68.8 KB Created: 2021-09-25 03:58:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c2f4a857205f29e2e7de1ba227e9557f SHA-1: 91e62da88c26f3ece24ad17094b94d67496c113c SHA-256: 7d4912b1e6d49ef1e7c5542d33eb6ca3afc0761099d406762ff922e84adc83bc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The primary purpose seems to be directing users to external sites, likely for phishing or to download further malicious content. No scripts were extracted, but the PDF structure and embedded URLs strongly suggest a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://irlanc.ru/uplcv?utm_term=google+play+app+download+for+computer PDF link annotation
    • https://vgi-vn.vn/app/webroot/img/files/bawalikapelupiwoxurim.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/7474a06fb889cd810fc49fdc516b25d6/zibenulika.pdfIn PDF document text
    • http://rowadhr.com/app/webroot/upload/files/90903698326.pdfIn PDF document text
    • https://fier-forjat-valimet.ro/ckfinder/userfiles/files/35318616573.pdfIn PDF document text
    • https://mayphoviet.com/media/ftp/file/jaguzelokuletatavepakaru.pdfIn PDF document text
    • http://silver.jo/ckfinder/blanc/files/21327011848.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/4b3d5eed16016ee81796986dbb4bd12c/61393912298.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134143ce5dd6---furugaroxibadifazewo.pdfIn PDF document text
    • https://angel-juicer.com/FileData/ckfinder/files/20210913_85C39986DFCDC040.pdfIn PDF document text
    • http://pachinkoevent.com/sites/default/files/file/26428197514.pdfIn PDF document text
    • https://xn--nmqu14inmf.com/upload/files/futogowuza.pdfIn PDF document text
    • http://apnm.indexint.net/ckfinder/userfiles/files/juzigep.pdfIn PDF document text
    • https://riwg.in/userfiles/file/tidasitekewad.pdfIn PDF document text
    • http://laihoawedding.com/app/webroot/upload/files/jajefifedazulawagudi.pdfIn PDF document text
    • http://7166867.ru/ckfinder/userfiles/files/45471449111.pdfIn PDF document text
    • http://shriadinathbank.com/uploads/3045830518.pdfIn PDF document text
    • http://muacuoi.vn/Pictures/files/34161214787.pdfIn PDF document text
    • http://baodieptailor.com/uploads/2021-09-18/images/files/witez.pdfIn PDF document text
    • https://ags-car.60km.com/upload/files/12443697125.pdfIn PDF document text
    • http://dobermanncz.eu/files/keperodilefabaxeduj.pdfIn PDF document text
    • http://skiflogistics.ru/userfiles/file/zutofefebaka.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/ebdfd469087d13cda622048f7487bbf6/xagekovupegevikoninizo.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_off0000acf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xACF6 11040 bytes
SHA-256: e0ec218fb72d3d2046dd1e71650bd5a9f950557a3a6a8fb576960f094490350d
font_01_sfnt_off0000c69d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC69D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000deaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEAF 15264 bytes
SHA-256: 49552b91ce82753408f2e0084229825ecfca912b26b582cbb23a7277b05f3918