Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cca46537b2f95c9…

MALICIOUS

PDF

82.5 KB Created: 2021-09-08 06:32:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 960355a86cbed926dc5a66369da543c7 SHA-1: 081b0be81c7db12bc6d11ce5fd9d335705111be1 SHA-256: 4cca46537b2f95c988a0224515f19a95c0a58ff169bacc761ec5e6938012a6d2
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised or disposable hosting, suggesting a phishing or credential harvesting attempt. The presence of external URIs and the nature of the hosting further support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://peterpan1996.it/userfiles/files/dopoxikirusuli.pdf In PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607adf25c657a---lekopekapiposu.pdfIn PDF document text
    • https://office-agglo-larochelle.fr/userfiles/file/zesinaj.pdfIn PDF document text
    • https://aiaciran.org/cache/fck_files/file/zituxokamesavegubepemu.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607cf9b86bc74---xinazijovugokanekiga.pdfIn PDF document text
    • http://seventyfirstclassof69.com/clients/60772/File/81202233508.pdfIn PDF document text
    • https://sieuthimayphat.com/ckfinder/userfiles/files/jozugesaxusuwomelozo.pdfIn PDF document text
    • http://evo-models.com/uploads/userfiles/files/tejiruzuzep.pdfIn PDF document text
    • http://phuocthuan.vn/images/pic/file/mikuwox.pdfIn PDF document text
    • http://newgrids.com/userfiles/file/pupedepaniwerukogavuseki.pdfIn PDF document text
    • http://ud2-140.com/files/tewafugimukabesakowifilo.pdfIn PDF document text
    • https://evergreencans.com/userfiles/file/26452860493.pdfIn PDF document text
    • http://vivaibonomo.it/userfiles/files/7867480329.pdfIn PDF document text
    • http://hoteldanang.com/uploads/images/files/jadolefawevegavi.pdfIn PDF document text
    • http://pettwayfamilyreunion.com/clients/39389/File/56505838481.pdfIn PDF document text
    • http://abogarestudio.com/userfiles/file/xiwarupewufofenogorezor.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/dukedakigolusudibe.pdfIn PDF document text
    • http://appinaris.net/ckfinder/userfiles/publics/files/6756820256.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/51546621728.pdfIn PDF document text
    • http://www.biosafety.biz/ckfinder/userfiles/files/97818118431.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f38150c734---jufomajepamasugisaga.pdfIn PDF document text
    • http://lnshiyue.com/userfiles/file/20210725051409_1166950405.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/92fecf9b5fc6bb5a995169d5df4b2060/jumijibejoloz.pdfIn PDF document text
    • http://enjoy.sk/editor_uploads/system/files/sexetavepawulagid.pdfIn PDF document text
    • https://etre-cheval.fr/Applications/MAMP/htdocs/etre%20cheval/news_pix/file/91835971786.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=regrets+of+the+dying+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_off0000dc4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC4A 18156 bytes
SHA-256: a863cad6097e8db9da5d7c738c53787b7c0ba7ffd55acf600446beef90843ab1
font_01_sfnt_off00010c17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C17 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001242e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1242E 10728 bytes
SHA-256: b6e6feeeadf048ddd50224955df5eb388372454803ad8ec2b522756620859bc9

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