Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac082c2f9f726d75…

MALICIOUS

PDF

83.8 KB Created: 2021-09-17 21:45:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 49ef5b5dce479ee468f7c42da2f8a3a4 SHA-1: 2ad87da3a141dffa4c69192f7c13ba01100b8f9a SHA-256: ac082c2f9f726d75677c3e76bbaa881999ea194cc2281f301f434b3ca4860acf
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and multiple external URIs, many of which point to compromised CMS uploads or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a link farm designed for SEO manipulation, and the presence of a JavaScript stream suggests malicious code execution. The ClamAV detection further confirms its malicious nature, likely as a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 https://archism.ru/uplcv?utm_term=beamng+drive+download+for+android+no+verification PDF link annotation
    • http://art-wonders.com/ckeditor/ckfinder/core/connector/php/uploads/files/fotizedumakobotivesobavop.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161399ae88ee66---bebikefawifimozotanu.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/73508974146.pdfIn PDF document text
    • https://hglobaltourb2c.com/FileData/ckfinder/files/20210909_BD663A82BC2AFC6E.pdfIn PDF document text
    • http://ssaisarang.com/ckfinder/userfiles/files/wimutono.pdfIn PDF document text
    • http://venusland.vn/app/webroot/img/files/19817565343.pdfIn PDF document text
    • http://nfrostov.ru/upload/files/wetuwevegizekitabaw.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/sawidomokelopugarenofibi.pdfIn PDF document text
    • https://bliznacite.com/files/23390047838.pdfIn PDF document text
    • https://singhaniabrothersltd.com/ckeditor/ckfinder/userfiles/files/wexeniminopinajazabi.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613f64162f4de---lagenobujefe.pdfIn PDF document text
    • https://driftwoodcc.com/userfiles/files/lomumadupivowatigepuwate.pdfIn PDF document text
    • http://daimarconstrucciones.com/images/admin/file/debepabemewuvabal.pdfIn PDF document text
    • http://maraulsan.com/ckfinder/userfiles/files/99512175778.pdfIn PDF document text
    • http://labellebeaute.com.hk/ckfinder/userfiles/files/77779437090.pdfIn PDF document text
    • http://xn--80aafjbawrcdgsodbdciig4a5v.xn--p1ai/pict/file/29955429061.pdfIn PDF document text
    • http://nwatchonline.net/userfiles/file/57755113406.pdfIn PDF document text
    • http://tahyuh.com/uploads/files/202109020102046935.pdfIn PDF document text
    • https://projekt-lesen.de/userfiles/file/79943272930.pdfIn PDF document text
    • http://lnv-cnc.gr/userfiles/file/2353228292.pdfIn PDF document text
    • http://telekommarketing.com/firme_data/files/65300027601.pdfIn PDF document text
    • http://emeat.ru/var/files/wozok.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee5b937c4c---tamukosud.pdfIn PDF document text
    • https://mediacentre.heathrow.com/js/ckfinder/userfiles/files/gomagegoduvumopufeju.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_off0000e082.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE082 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f894.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF894 17764 bytes
SHA-256: 2027f422c61ba83aff1faebc20b9d557e127beea042250d99e7f1c4ad1fde3a4
font_02_sfnt_off000126ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126AC 10856 bytes
SHA-256: 68454ffa54e46be5788a5b47110372a3241274b3e2b2c568c7b524fa2474e6d9

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