Malicious PDF — malware analysis report

Static analysis result for SHA-256 a18438473d3c0872…

MALICIOUS

PDF

75.3 KB Created: 2021-08-16 17:54:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 37a9a738c163a41c72c4c60d987007e0 SHA-1: c0f07aafaec28cf2e17c2f9ab6c23e50620ba58d SHA-256: a18438473d3c0872d5b74985c8b44300a081aceaa5c246e1317935d9eb0336cf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm with multiple URLs pointing to potentially compromised CMS upload directories, suggesting an attempt to distribute malicious files or redirect users to phishing sites. No scripts were extracted, but the presence of numerous external links indicates a likely attempt to lure users to malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 http://adamlegal.com/userfiles/file/73432310644.pdf In PDF document text
    • http://fqcycpa.com/jingkelun/userfiles/files/20210709210045.pdfIn PDF document text
    • http://zoncmswebsitebeheer.nl/files/editor/file/girupavupe.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/a1b039ef13702e97e2dd2028cb0d81bb/34366949781.pdfIn PDF document text
    • https://karapinarinsaat.net/userfiles/upload/file/6323422241.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0b91893e82---simop.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16118a1da3ae38---mazusizobuvuzaradewulin.pdfIn PDF document text
    • http://tantusmarina.com/UserFiles/file/51931478785.pdfIn PDF document text
    • https://ltanimalpark.com/wp-content/plugins/super-forms/uploads/php/files/b752a7941148475777bde0a036eb7d7f/63845312746.pdfIn PDF document text
    • https://forthepeoplegov.com/userfiles/file/97187822943.pdfIn PDF document text
    • https://www.gasserbush.com/wp-content/plugins/super-forms/uploads/php/files/061b808702e03cfa8aed3ca7db2a669b/9548938250.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/1607366b2cd4e5---15502551232.pdfIn PDF document text
    • https://skinrepublic.vn/webroot/img/files/mapadosepamuduvolus.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160db561a5fe88---85651425791.pdfIn PDF document text
    • http://dbexpertise.fr/catalogue_dynamique/file/kevexigufirinagisefabuvo.pdfIn PDF document text
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/30cead9ce73a0e3709e947f6daa67362/xuvivaviniluzijimev.pdfIn PDF document text
    • https://sportsslife.net/upload/ckfinder/files/kokusevoj.pdfIn PDF document text
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160782162b71c0---mifurazojefiladotifedule.pdfIn PDF document text
    • http://yangpupark.com/uploadfile/files/befavokop.pdfIn PDF document text
    • https://martabaktelor.com/contents//files/24683334049.pdfIn PDF document text
    • http://sheilahancock.net/blogfck/file/30244505957.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/602a3c07aaeb45ca928923c9ed85a61c/69274488265.pdfIn PDF document text
    • http://chaitraglaze.com/uploads/gudabitebejozijetifuva.pdfIn PDF document text
    • https://glbtrader.com/userfiles/file/59938384518.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=rome+engineering+an+empire+video+questions+answer+keyPDF 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_off0000bfb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFB8 16640 bytes
SHA-256: 7589a381b71f759cbc4e8706d6bef22ddcfe786b4879c8f8a4800efb31a17138
font_01_sfnt_off0000ea91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA91 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000102a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102A8 11336 bytes
SHA-256: 0a73fc882a5396f1132e491613b8e2dd855fa256a1c6470339ef2d94c81925eb

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