Malicious PDF — malware analysis report

Static analysis result for SHA-256 822a1bec2b8dd700…

MALICIOUS

PDF

80.4 KB Created: 2021-09-03 04:13:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: dbb753ff163609ad8d768a2a505cd3e2 SHA-1: 1d63a469e7643d241ddc70d90c8d59b698334d50 SHA-256: 822a1bec2b8dd7003a784a3c3f326b7ba0bb9a7b60be2d12ab6d775f196bf203
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and unreadable, providing no direct clues to its specific purpose beyond the presence of these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://krevue.cz/UserFiles/File/lepapipaf.pdf In PDF document text
    • http://dambi.pl/userfiles/file/tamadapiwobopilofebuz.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/3ab7b58eb161ef1c0858a4f1ca0b99c6/76382082790.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c28e3d7bb95---gepilozomi.pdfIn PDF document text
    • http://marcth.pl/media/fck/file/14279447746.pdfIn PDF document text
    • https://www.pessin-location.fr/ckfinder/userfiles/files/kedizinabawejexila.pdfIn PDF document text
    • https://markeishahall.com/wp-content/plugins/super-forms/uploads/php/files/46db756c193686bc3d42daa885131743/67654041408.pdfIn PDF document text
    • http://efuturesthai.com/uploads/file/tugojitixukarul.pdfIn PDF document text
    • http://www.dismaplant.com/ckfinder/userfiles/files/58338780467.pdfIn PDF document text
    • http://hangtatmj.com/userfiles/65105184981.pdfIn PDF document text
    • https://artenika.pl/fck/file/79946153423.pdfIn PDF document text
    • http://lactopad.com/uploads/files/79155833254.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/7ca04021a7545ba549398367d96a8cdf/82334944080.pdfIn PDF document text
    • http://villapellegrino.it/userfiles/files/jekirupopasiwavu.pdfIn PDF document text
    • https://argumentua.com/i/file/27142507207.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b98510c55a---sewelukuxibileze.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc094026a9---kekedu.pdfIn PDF document text
    • http://suachuaspa.com/upload/images-content/files/walovadu.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1612b734ef18d2---19305761253.pdfIn PDF document text
    • http://needychild.org/ckfinder/userfiles/files/73117637205.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/c9dcf2794549068c6807a432808dbcee/67953371585.pdfIn PDF document text
    • http://nhadatv.com/webroot/img/files/nelofa.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160847a7632097---misuzavude.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/53bcae8d30d50190ad69f380057ee0d0/tusaperezomav.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/1e29bf2121a39dfc157877eb9225882f/216379096.pdfIn PDF document text
    • https://kfmaccounting.com/webroot/img/content/files/41770616911.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=definisi+demokrasi+menurut+para+ahli+pdfPDF 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_off0000d785.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD785 10956 bytes
SHA-256: a95e6f5e215378f8ae501a2e0687ad57a95dfafac48ceba42c43523eed63d103
font_01_sfnt_off0000f0ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000108cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108CC 16460 bytes
SHA-256: f0739afd36a0cca7d5005506e608d2e8c6292a2de9901dcac39c9d5270ec6a17

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