Malicious PDF — malware analysis report

Static analysis result for SHA-256 4dbc8a1cccfead67…

MALICIOUS

PDF

91.7 KB Created: 2021-07-26 07:24:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 7499d0696faacc39e63961c684f5b9bc SHA-1: 183ea5aa8c1817d45f2345dfb5e1919969da16a5 SHA-256: 4dbc8a1cccfead678ea809059bebd74cd4121d2ac3da7c9af7128f92d62ef5f0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, pointing to multiple compromised WordPress sites hosting PDF files. The presence of a download button lure further supports a phishing or malware distribution scenario. Although no scripts were explicitly extracted, the PDF structure and link farm behavior suggest it's designed to trick users into downloading a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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.
  • 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 http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a55b1b5433d---wuxogaxefo.pdf In PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/160a01fef7b067---57283978107.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/e3e02e3cdbcb7f9eb98482c1e69363af/bibavepetifumowas.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160795c5e29fa5---65461167882.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c715a16fd07---fotejanimobidutuv.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/a258d1d45ab8cfb0e86c8288bdf3706c/wamafavofafo.pdfIn PDF document text
    • http://shuswapladystriders.ca/userfiles/file/popujeporopivuwawof.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607474bed324d---82720722041.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a84e226a575---sexepu.pdfIn PDF document text
    • http://thesetnews.com/images/fckeditor/file/89052893195.pdfIn PDF document text
    • https://ubk-sad.de/azubi/userfiles/files/28558261543.pdfIn PDF document text
    • http://maxidmum.com/images/upload/fck/file/mupexozeganajezope.pdfIn PDF document text
    • http://archerelectricsupply.com/userfiles/file/77730637971.pdfIn PDF document text
    • http://geometrabottero.it/userfiles/files/19676720941.pdfIn PDF document text
    • http://gruppocinofilomarsalese.com/userfiles/files/61697605656.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160775b558b66d---73966903022.pdfIn PDF document text
    • http://wallawallahighschool1968.org/clients/75819/File/65884948742.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/vemugekitojaxoretarovot.pdfIn PDF document text
    • http://teaandtiara.ca/clients/c/cf/cffd5a667a547ddf6f7ed7e454f715b7/File/22870890340.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/498356330.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d48445d20d4---71002224724.pdfIn PDF document text
    • http://griswoldremgmt.com/uploads/files/68161284733.pdfIn PDF document text
    • https://poolpoint.be/uploads/file/munisazefoweg.pdfIn PDF document text
    • http://lucavolpicella.it/userfiles/files/vovine.pdfIn PDF document text
    • http://marthomaiticherukole.com/userfiles/file/dilotosik.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=al+quran+surah+yasin+bangla+translationPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e805.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE805 18108 bytes
SHA-256: 665b37d22687ffe632737f70193c47335a43b792fa93795a1ed93d750dea57c3
font_01_sfnt_off000116b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116B9 16500 bytes
SHA-256: dae20c8a83014560549260ac8f29ae6c5c327805702a1a9549a5317854c97ebc
font_02_sfnt_off00012d89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D89 10736 bytes
SHA-256: 2decbea85648c14815cee9fb48d51653fa037f89dcb1a672dccc9b52d788ddaf
font_03_sfnt_off000145d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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