Malicious PDF — malware analysis report

Static analysis result for SHA-256 a21ae81eb872828b…

MALICIOUS

PDF

77.9 KB Created: 2021-09-21 01:49:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c1f4910715b68b4b86b458af032bcaef SHA-1: 24a722d8074c4d97541810902108a837fc3e5659 SHA-256: a21ae81eb872828b2745e6858823a744ac980684b12f3cfa261cfb8a739a15ee
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed for redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://smidgel.ru/uplcv?utm_term=dancing+road+colour+ball+run+mod+apk PDF link annotation
    • https://processwork.archerhuang.com/ConImg/files/ruloluzulow.pdfIn PDF document text
    • https://www.tcf.gov.tr/ckfinder/userfiles/files/kafalugesopumaxiwefoju.pdfIn PDF document text
    • http://hani-bee.com/userfiles/files/32240421117.pdfIn PDF document text
    • http://elektromig.pl/userfiles/file/jariwokotogat.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/67d0597a5ff68c5c141ab39f3684f558/31520867469.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/s85g321iomhoo01t3uj7vnsv75/finatijuvokuxa.pdfIn PDF document text
    • https://presentkompaniet.com/img/content/file/3035291834.pdfIn PDF document text
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/jk6vlo0tu5edv3o0daevthb3e2/sibifufu.pdfIn PDF document text
    • http://avs-market.ru/admin/ckfinder/userfiles/files/bukono.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/e9e9bb4462e0596a80e382c9c96e6e5b/8636987229.pdfIn PDF document text
    • http://www.majbrno.cz/uploads/files/dofogelozadim.pdfIn PDF document text
    • http://due.pt/js/ckfinder/userfiles/files/xufiwon.pdfIn PDF document text
    • http://shriramashramps.org/userfiles/file/geloreroxafezafa.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/wakuradulisiwuwimo.pdfIn PDF document text
    • http://hiro-seiko.com/upload/files/42420888375.pdfIn PDF document text
    • http://chanhbon.vn/media/ftp/file/wapusewamusunewetiro.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/e8350ab006b80c3cdf5f9bf30c9627b3/silusunezufowuwaduzor.pdfIn PDF document text
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/e645af68bd8a2cd9659f85bb31a524bf/lexewabegozilawajexosa.pdfIn PDF document text
    • http://expertsystemgroup.com/file_media/file_image/file/rutomevawo.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/be22054dcb034e78073bb04a731bd482/menaxitomewabubuf.pdfIn PDF document text
    • http://bud-med.eu/userfiles/file/bozujusixolodojinum.pdfIn PDF document text
    • https://degardo.hollandpazsit.hu/ckfinder/userfiles/files/93011013187.pdfIn PDF document text
    • http://flairpens.ru/uploads/file/bapezesusejijugulowowa.pdfIn PDF document text
    • http://naturestuff.nl/siteimages/file/vulemeliwikenukusilejubij.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_off0000c2cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2CF 10792 bytes
SHA-256: 6e996211beb562787208f7503e9a5155e4790c5c8823802d70bd01e637083dfa
font_01_sfnt_off0000db1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB1F 20304 bytes
SHA-256: 959aeb82d18c089e1b446f6876b20a3e6395167f14cfd89e7f2bf253720183c5
font_02_sfnt_off00010fea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FEA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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