Malicious PDF — malware analysis report

Static analysis result for SHA-256 83ec68302e920d94…

MALICIOUS

PDF

83.8 KB Created: 2021-08-09 05:01:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 33a585bca4c5a39d97ddbca53fca5fbb SHA-1: d2a0baa6e2abbf50a058cfb97c35e3ea37b1de80 SHA-256: 83ec68302e920d94b1101719eadcb5213c0bcfebb99429ccf089a2f370727822
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users to malicious content. The document's structure and embedded URLs strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/876ab92abd28b81bb89dbd98a6948807/56330483845.pdf In PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/1bdb706ee37206587f351c54aaf7d408/waxekukadubili.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/0bhtkemo17ppuem4q000aofb45/nabinelajetekix.pdfIn PDF document text
    • https://www.cdsale.org.au/application/third_party/ckfinder/userfiles/files/17020841416.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160856f608fa3c---pobebu.pdfIn PDF document text
    • http://nakamurasangyou.jp/app/webroot/uploads/files/wonugetixilurekusoduxa.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/88a9aace077d4269c2fae7e4691a6224/14946143682.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/m8e8fn38388qvtpka3t9jcu8s2/paful.pdfIn PDF document text
    • https://africanresearchcenter.com/userfiles/file/peparokedufe.pdfIn PDF document text
    • https://primer-spb.ru/files/files/18836469643.pdfIn PDF document text
    • https://springkasteelhuren.be/userfiles/file/fujaboluwotesudo.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e2e49bf8a5---22100265067.pdfIn PDF document text
    • https://wittnebel.dk/file/bemavugilosajik.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/gmabbhd4t1vptbfgvkt70rc750/kexubofejaxaka.pdfIn PDF document text
    • https://suma.ca/upload/editor/file/loxosexapo.pdfIn PDF document text
    • http://xn--72c7caerxx0d3a9eve.com/UserFiles/File/31395000073.pdfIn PDF document text
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/4v3vfvkqqj7hc3sf3mmsopaqo8/2421367919.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/tabatumitajowefuwujukad.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/487f7caa0371371b04a9d6ba7d4bfabd/41358862656.pdfIn PDF document text
    • http://bestapp4u.com/admin/uploadedfiles/file/sisazaselatuw.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/eo84dm1iusa6890gemj96ga7cm/womozevoxarubali.pdfIn PDF document text
    • http://mexxeopaint.com/upload/files/zizekabalalabeseledu.pdfIn PDF document text
    • http://yossy.biz/userfiles/file/16540153614.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608e59b63b23f---69439739542.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=how+to+do+a+balance+sheet+for+small+businessPDF 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_off0000e482.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE482 11060 bytes
SHA-256: a922ed13e41992b06b1c110dadcc57ac8bf56e3a3a8f63d33db273dc84ae9faa
font_01_sfnt_off0000fe08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE08 16772 bytes
SHA-256: cc96c716e5154bd85accfe9b1cc396814e498bcf3bb745e6389948e159b72cc3
font_02_sfnt_off000129d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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