Malicious PDF — malware analysis report

Static analysis result for SHA-256 f71d1da984201d3a…

MALICIOUS

PDF

75.2 KB Created: 2021-09-03 07:43:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1db59df7dd9d3b0c57fa0a7d91f26f2c SHA-1: 2e917dcc9cc3893427ddab1f3cb65b6a8a3c3444 SHA-256: f71d1da984201d3a1d2064f59ad95ac1b183dc028b646d173f0b7ad988e6bc4f
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 or disposable domains, indicative of a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support its malicious nature. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further reinforces this assessment, suggesting an attempt to lure victims through search engine optimization or by leveraging compromised web infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://thedewakohchang.com/image/upload/File/isukexojijujisi.pdf In PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/5658b11d960ef854e613490ca797083d/48118189041.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16104e47b5a85d---54909019241.pdfIn PDF document text
    • http://tpokebar.com/uploads/files/xikazavukefinowomava.pdfIn PDF document text
    • https://www.drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160aa9ecd5cb1b---lukimodo.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/zikizovoto.pdfIn PDF document text
    • http://bettynblue.com/upload/fck_img/20210522/file/24209459382.pdfIn PDF document text
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/qcdor8igdv1ni4jt5rr5ahe9b6/11493623708.pdfIn PDF document text
    • http://bakoca.hu/files/file/3921174533.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/1c55f3068a19981247d6d7c346791da6/kifozogoro.pdfIn PDF document text
    • http://www.temaricerca.com/entry2013new/admindia/ckfinder/userfiles/files/xaxirixobodirosafu.pdfIn PDF document text
    • https://sca-kc.com/scauserfiles/files/95317792526.pdfIn PDF document text
    • http://mea-travel.pl/userfiles/file/zedon.pdfIn PDF document text
    • https://fratellifurloni.it/file/gotimitegutumafupegob.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/pojilopugezexajaxerewates.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e2180d32a07---vomubome.pdfIn PDF document text
    • https://www.adilaltinsoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160743da716679---lixatawumebuvu.pdfIn PDF document text
    • https://cochleartudaskozpont.hufiles/31672993177.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/160afa67d736c1---lunogulebizuguvisanevuwe.pdfIn PDF document text
    • http://grgct.com/ckfinder/userfiles/files/86905439966.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=job+search+tips+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_off0000c2c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2C1 17180 bytes
SHA-256: 1625e3cebe6794d529f08847b569bd5bb2d1a4319acd21e905c6a9927df4db21
font_01_sfnt_off0000eed9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEED9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000106f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106F0 10700 bytes
SHA-256: 750499a7782d980443d84ff4dce29c8e9893673e14ba9c360c59fd2bee5810b4

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