Malicious PDF — malware analysis report

Static analysis result for SHA-256 36ea729b59ab3ea0…

MALICIOUS

PDF

88.1 KB Created: 2021-07-02 15:17:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 995995f5260ddd3798f05bd8072bbd87 SHA-1: b58925800d737139462c1a527f6063d324ff4898 SHA-256: 36ea729b59ab3ea0b02a72e805d06b31fda15ca8c5d5a30f5258a0b0e3dc4cf6
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised CMS uploads and disposable hosting, indicating a link farm designed to redirect users to malicious sites. Heuristics like 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggest this malicious intent. ClamAV detection further confirms its malicious nature, likely as a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 https://wastran.ru/uplcv?utm_term=spinous+process+fracture+icd+10 PDF link annotation
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160987bd14e19d---pijidudodunitowobex.pdfIn PDF document text
    • http://amon-syotengai.com/userfiles/file/fovojilixu.pdfIn PDF document text
    • https://vansuloi.com/uploads/userfiles/file/rofofojenad.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/1693cd3d96d848cb7eb1cc65ee84b183/nisiw.pdfIn PDF document text
    • http://s2ipower.com/survey/userfiles/files/74753580048.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bc4d3e7f522---wuzarakinobevifuw.pdfIn PDF document text
    • http://cambresisemploi.fr/ckfinder/userfiles/files/fuvepedefub.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/1672880f869fed41f155673e3d198864/24933070195.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/0f7641c08fdd3133625007d90f699406/79556196466.pdfIn PDF document text
    • http://visit-pune.com/userfiles/file/gufuwozaj.pdfIn PDF document text
    • https://alrukn.co/userfiles/files/ralajoguzozo.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b95dcbed4e844c5ea41701a2f7dc0be8/46359443162.pdfIn PDF document text
    • http://izeninfo.net/admin/upload/files/niseliwoxalevivosijegelom.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b97d56ecccf---pevupumixadob.pdfIn PDF document text
    • https://aslimitada.com/userfiles/file/43137148377.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094afc044162---kejesatamike.pdfIn PDF document text
    • https://clubsecurite.fr/webroot/upload/files/siruripovokewazura.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/p3pssir11dameoot8ggia7pev3/40650327742.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/2165d8cac7ca6d48d59190d8f0c496ec/1952791504.pdfIn PDF document text
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/tjag8t7fibr21sb7osltfvjp48/44891019398.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/09a47fce2a41d2a223d007aec7f24a47/kogomozarer.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/c142526d0f37605afb0f366683ca06f8/kusagajubikitarad.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa29fb3fcc---faluzawazi.pdfIn PDF document text
    • http://sportsgarten.com/editorData/file/30450620420.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c67faec265c---worelaxolavixod.pdfIn PDF document text
    • 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_off0000f10e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF10E 17824 bytes
SHA-256: 86ca12edc9a10cd048b747a6c14c8393aae35ec6e8ead512d20a0438dd0cae50
font_01_sfnt_off00011fd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FD2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000137e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137E9 10916 bytes
SHA-256: 2a22647652ce180a7397be3a030dd7328428e8053d56ba5fe643748f445085af

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