Malicious PDF — malware analysis report

Static analysis result for SHA-256 03d36ace65b1d480…

MALICIOUS

PDF

78.8 KB Created: 2021-09-04 20:32:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5cf8ce29602effdc7135ccec077c155c SHA-1: 52535bf786ab0b96c6240cc891e6dae774eda26c SHA-256: 03d36ace65b1d480bbe5fe35012c287f6704b3666b0539b19291534981c819b5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of links, many hosted on compromised WordPress sites, suggesting a link farm designed to redirect users. While no scripts were explicitly extracted, the nature of the link farm and the detection as a trojan indicate a likely attempt to deliver a malicious payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/81c9013cc9ed57bbd031cf1eec889be2/23240041614.pdf In PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16083ef2e4c939---rejivaxoxiwu.pdfIn PDF document text
    • http://studiopetrilli.it/userfiles/files/22952916119.pdfIn PDF document text
    • http://stinpo.com/ckfinder/userfiles/files/xevonelinudarolo.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/45f0e024c2f6b0ecf730b191bd327147/buwikedefupiridadudo.pdfIn PDF document text
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/644790c2fad23790481a608226a623f5/pofudajaso.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd3de3f207---65517733896.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/1518f5e064368efd276aca3327b60b12/55987684553.pdfIn PDF document text
    • http://canxetaianhduc.com/images/file/vuvagag.pdfIn PDF document text
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/5afaep0bqp3n2ard7lgvfm1lus/vexeguparug.pdfIn PDF document text
    • http://jysfh.com/upload_fck/file/2021-8-13/20210813042533486031.pdfIn PDF document text
    • http://grandchainfamilyfoundation.org/clients/85333/File/guzetimetesodi.pdfIn PDF document text
    • https://stehovani-ostrava.cz/static_pages_files/file/77093838040.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bcd167422d---mepopexevimakejafiju.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/lajuvimetuxonukolojebif.pdfIn PDF document text
    • https://www.autodepotperformancegroup.ca/wp-content/plugins/super-forms/uploads/php/files/bqkgg8faidberocfuejkr32mv1/96913128824.pdfIn PDF document text
    • http://agiusfuneraldirectors.com/files/file/83587455866.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d17080177c---20247502093.pdfIn PDF document text
    • http://af.ssla.ru/images/fornews/files/gikojagoribazadonegafi.pdfIn PDF document text
    • https://szallas-karpatalja.net/upload/99300003827.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/ivrrnbl534klbg70iuu9rcbc72/19656278772.pdfIn PDF document text
    • http://eiak.org/upload/editor/files/lonakabusizewo.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16095456e9eb55---47303892916.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c73c40f99c---28196446851.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=gtpl+kcbpl+channel+list+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_off0000cd4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD4D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e55f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE55F 18216 bytes
SHA-256: 6c460a69572a613b762069c9d4a40c262f9a9261483bb9e4bf76cb68b330f6d7
font_02_sfnt_off000114db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114DB 10768 bytes
SHA-256: 07d58b875e888cbf818ce7d6459d09248c633de6a06d971f3ef8ad1c5d4edfe9

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