Malicious PDF — malware analysis report

Static analysis result for SHA-256 50f05f27d3b02a9d…

MALICIOUS

PDF

88.5 KB Created: 2021-09-11 20:51:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6bbe6c54a2ecec9a6a14d546a7c6686b SHA-1: 73a48f6a374bb568c7e4d0473644279ddb639c84 SHA-256: 50f05f27d3b02a9dea068fb63117300a8a7b7d35c49b8012546a7aa4f50d94d4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains embedded JavaScript and a significant number of external links, many pointing to compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a non-clustered link farm on disposable hosting, suggesting an attempt to lure users to external sites. The embedded JavaScript, while not fully analyzed due to obfuscation, is a common vector for further exploitation. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://atmaircenter.com/lb/userfiles/files/88345159818.pdf In PDF document text
    • http://purplebyanki-com.bvirani.com/ckfinder/userfiles/files/65492677845.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/161360172842ab---34129757330.pdfIn PDF document text
    • http://tw-jia.com/uploads/files/202109102335103468.pdfIn PDF document text
    • http://chulatutoracademy.com/chulatutor/ckfinder/userfiles/files/sopej.pdfIn PDF document text
    • https://ppntassone.it/dati/upload/file/mimakivilogivulegupodujiw.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613a811288ec1---domovodufabebafasovixa.pdfIn PDF document text
    • https://forumhrdbekasi.com/webroot/userfiles/files/kokijipuzof.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613206d841730---tamenij.pdfIn PDF document text
    • https://piauiaqui.com/ckfinder/files/60829784796.pdfIn PDF document text
    • https://baoholaodong24.com/userfiles/file/73835149052.pdfIn PDF document text
    • https://cortopolis.ar/userfiles/file/reseronutirugagefewuko.pdfIn PDF document text
    • https://indiansabroad.uk/userfiles/file/zibejotatamukazigem.pdfIn PDF document text
    • http://vonschickenfremont.com/uploads/files/zisuzigiziwisapuj.pdfIn PDF document text
    • http://jevades.com/aircraft/fckimages/file/73540048129.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/2f91ec0f76b953e6eadf716ab17237c1/zetojedugotolobufovesari.pdfIn PDF document text
    • https://marathonlaval.com/userfiles/files/sogura.pdfIn PDF document text
    • http://giaydantuongphongngudep.com/images/news/file/zegokisevisuwas.pdfIn PDF document text
    • http://thucphamchucnangmy.vn/uploads/files/37464637403.pdfIn PDF document text
    • https://imad0c0.com/js/ckfinder/userfiles/files/tulonufobi.pdfIn PDF document text
    • http://www.velkoobchod-man.eu/ckfinder/userfiles/files/84661330145.pdfIn PDF document text
    • http://cy2hand.com/userfiles/1683461519.pdfIn PDF document text
    • https://vico-real-estate.com/ckfinder/userfiles/files/xoxep.pdfIn PDF document text
    • https://valleyrentals.com/userfiles/file/28866022695.pdfIn PDF document text
    • http://kibbkw.com/uploads/file/83501768805.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/33864e11ef52446eae40686995233eb9/kawerimixexe.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/rugifekinuwemurix.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/4pjoh83v2acmup2qrbfujuj35a/4772172204.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=get+out+movie+streaming+indiaPDF 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_off0000f4c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4C2 18048 bytes
SHA-256: a9a67e972fd9e32d6f21e4624510a876af3de36af75e397100aaa41605d4c314
font_01_sfnt_off000123b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013bcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BCF 10752 bytes
SHA-256: 628c3345e7e80ea911869cd7680783bae14e2f2ec61fbe40da9889e0f7f2df44

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