Malicious PDF — malware analysis report

Static analysis result for SHA-256 61744b65a8cd5c6e…

MALICIOUS

PDF

82.9 KB Created: 2021-07-18 13:58:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0ba9028793ec93ff0e2798e0417cf631 SHA-1: 179a48589da2137c0ee9692a0949e189f5c1522d SHA-256: 61744b65a8cd5c6e458a222cd0dd89bad1ae5e2d643a1a949c501566175db410
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The 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 numerous URLs pointing to potentially compromised or disposable hosting. These links likely serve as redirects to phishing sites or malware download pages, aligning with a common attack pattern for malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://mimpishio1bet.com/contents//files/4614557862.pdf In PDF document text
    • https://parokisantolukas.org/Uploads/userfiles/files/13786797966.pdfIn PDF document text
    • https://etre-cheval.fr/Applications/MAMP/htdocs/etre%20cheval/news_pix/file/dumidanokumuzozotap.pdfIn PDF document text
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/egdodc59q7hmm9rii7u5f9acq1/64240707987.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc8685ea50---bobegadopixigezaz.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/edhtqgca10pbbt0llq7vje28v6/53856025859.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e85651aab44---56116609865.pdfIn PDF document text
    • https://dalnoboy.com/data/filestorage/upload/files/mabiti.pdfIn PDF document text
    • http://ats-dz.com/userfiles/file/32636003038.pdfIn PDF document text
    • http://trans-serwis.com/userfiles/file/bezipuwivopesik.pdfIn PDF document text
    • https://loctra.net/userfiles/file/mejasigemanawag.pdfIn PDF document text
    • http://shahnawazonline.com/uploads/files/piwusozewa.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/072ff66e0084fccc761425aba65f7522/26719805258.pdfIn PDF document text
    • http://brenno-tojestto.pl/userfiles/file/kajunelafirop.pdfIn PDF document text
    • http://studiodugnani.it/userfiles/files/1615911963.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c17246695fd---palufevofirimopareritupe.pdfIn PDF document text
    • https://almuhja.net/ckfinder/userfiles/files/88969616208.pdfIn PDF document text
    • https://tcremich.lu/files/files/59085130306.pdfIn PDF document text
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/s1dhnt33uo5b193jucpr2cdblt/92082134332.pdfIn PDF document text
    • http://czdashan.cn/uploadfile/file/2021050104463173499.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/50141f5a34fe74ff894630c632ff497d/96999612932.pdfIn PDF document text
    • http://gillsandgeckos.com/userfiles/file/48286494808.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=tape+the+playPDF 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_off0000e509.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE509 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fd1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD1F 9844 bytes
SHA-256: 0f4beae2e772bf25ec1572c21f51948827900cbbdf30a453ea005f8b42349643
font_02_sfnt_off000112f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112F1 16868 bytes
SHA-256: 6f76825106e2c398d5c4f9f348c4d6e0f5187c31f2acc02b616ea9813ff51380

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