Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e80ffdbb3ae05bb…

MALICIOUS

PDF

86.5 KB Created: 2021-09-01 16:20:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b492b5e1c59fce8e1493c2e067b1e022 SHA-1: d915c740906102d1f19f0b4878c4fd4c9e8de90a SHA-256: 6e80ffdbb3ae05bb9147104980889e2f78b1d716e3ce654aa2f617c8607099d3
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to compromised WordPress upload directories and other potentially untrusted domains. The presence of a 'download button' heuristic suggests a lure to trick users into clicking these links. The primary goal appears to be redirecting users to external sites, likely for phishing or to download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610a45e2c341a---62690547687.pdf In PDF document text
    • http://trineckevzdelavani.cz/webpagebuilder/ckfinder/userfiles/files/ripukuwabi.pdfIn PDF document text
    • https://dichvumayphoto.vn/webroot/img/files/pamofelixowikitor.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/aa4f4fb9b1164a383b7395702556a6f6/50410486157.pdfIn PDF document text
    • https://aihr-iadh.org/uploads/FCK_files/file/dibaloxezuvuwimi.pdfIn PDF document text
    • http://hyswimpool.com/userfiles/78746337924.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609545621962b---28602708900.pdfIn PDF document text
    • http://hanabi-la.com/uploads/files/50121035535.pdfIn PDF document text
    • https://beyondpins.com/calisma2/files/uploads/dejusizonetaradigamaro.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/0sarc297oh4cgalbs46pn3s4lv/95551323556.pdfIn PDF document text
    • http://bellsazshihtzu.com/clients/878694/File/jokoxamotixusexivufudexeb.pdfIn PDF document text
    • https://www.americansummercamps.com/wp-content/plugins/formcraft/file-upload/server/content/files/160886016cc8bd---lumunenilubuledawupilopos.pdfIn PDF document text
    • http://czdashan.cn/uploadfile/file/2021050400582073499.pdfIn PDF document text
    • https://datawire.gr/files/files/39436700642.pdfIn PDF document text
    • http://forma8.kz/ckfinder/userfiles/files/53506436848.pdfIn PDF document text
    • https://ltgtrends.com/wp-content/plugins/super-forms/uploads/php/files/8ae5b5f64e1deaac27c5480c33b0a37b/xikirujubomowerub.pdfIn PDF document text
    • http://shopexpert.com/app/webroot/files/userfiles/files/43627708021.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/d44c48fa32ad127418854ec0926645c5/bulofitusuduxipevadel.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b05a87c166e---70724981797.pdfIn PDF document text
    • http://www.deep2001.com/images/library/File/41506450547.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ac99c4652e---gasozesakokowabapan.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab92e89b092---27940279323.pdfIn PDF document text
    • https://gilbertems.com/videos/file/7555870647.pdfIn PDF document text
    • https://jechrina.gr/FCKeditor/userimages/file/34809206146.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a749694bb81---metazomafidukafuwe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=addicted+2014+watch+full+movie+online+freePDF 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_off0000e9e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9E0 18444 bytes
SHA-256: 239a67a1f4c6fc2f5fa5493b259845bac43a9726f74b7686ac750bf50b531d54
font_01_sfnt_off00011936.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11936 11176 bytes
SHA-256: 8e1ff42ef921468dcfd2459270c82fb635b148dcbf37016f9b80ca3e31156d57
font_02_sfnt_off00013359.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13359 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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