Malicious PDF — malware analysis report

Static analysis result for SHA-256 aca3a332d7bcb7c9…

MALICIOUS

PDF

94.7 KB Created: 2021-09-07 11:22:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: b9c4ba42ede7c436eb0ca57b4db257df SHA-1: eb060ef14bd7e03fe27fa4b7b4c6ee589bd30b29 SHA-256: aca3a332d7bcb7c9c5998eaa94bb3d60c06f2db5fbab3c0e53e7a3616d292e27
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to download further malware or engage in phishing. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with a malicious link farm designed for initial access via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • 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.
  • 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://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fe362c9285c---35349336342.pdf In PDF document text
    • https://tasleemdubai.com/userfiles/files/90544519763.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/37924883875.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4c5ddf209c---velufoxim.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/9235380b6096791d107497e8a4620253/lojagigokiripikis.pdfIn PDF document text
    • https://forumsevens.com/images/file/tokudugizerinifazud.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160736e48662f9---50506364491.pdfIn PDF document text
    • https://progin.swiss/ckfinder/userfiles/files/67071722462.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/16081b1d5c1eda---96126003541.pdfIn PDF document text
    • http://elcivan.com/admin/UserFiles/file/zenevisotafus.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609133981b0a3---16691164075.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607830e82ec0a---wasesobomivukitexapofoxem.pdfIn PDF document text
    • http://malifer.hu/upload/file/takigok.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8b6f65e20e---fivagazu.pdfIn PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/cecf82a2a4cd120d3065213d5b7904e3/49156938353.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/78655787581.pdfIn PDF document text
    • http://yossy.biz/userfiles/file/lenub.pdfIn PDF document text
    • https://ensegun2.com/ckfinder/userfiles/files/67343507127.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/1mi1ma08blgi92n9t2ghrfm0rl/kefunofideboromuwekifuw.pdfIn PDF document text
    • https://www.helpforbusymums.com/wp-content/plugins/super-forms/uploads/php/files/9290872c3a3b8a2da2a91d0447521fd0/86273296083.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160920ec85cd51---84582590485.pdfIn PDF document text
    • http://lnyuanzong.com/uploads/files/20210807034545.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=persephone%27s+quest+entheogens+and+the+origins+of+religion+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_off00010bf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BF0 18372 bytes
SHA-256: 1fd018a7bb7c9d899a92868f757fd664ea26eb964e7ebdbc2945ebfbd4a0e33f
font_01_sfnt_off00013b83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B83 11060 bytes
SHA-256: 2dac3cf73b71d852850a615dd879847139f8ff3add94dd368dfc697ff0d4cbea
font_02_sfnt_off000154ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x154BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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