Malicious PDF — malware analysis report

Static analysis result for SHA-256 f69a74f7f231b75c…

MALICIOUS

PDF

100.4 KB Created: 2021-07-03 00:56:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: ccee05e52af478ca231670350aebd172 SHA-1: d071de8dfaa2d373326cea1b77f017bb938e2866 SHA-256: f69a74f7f231b75c1c98f86b8703b0b345c26d3e1ecb234ad7d831df723cc5a9
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm, with many embedded URLs pointing to potentially compromised CMS upload directories and disposable hosting. The document body is unreadable, but the overall structure and URL analysis suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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 https://castilloexterior.org/ckfinder/userfiles/files/42344663303.pdf In PDF document text
    • http://jjmcp.jp/userfiles/Image/file/17483346319.pdfIn PDF document text
    • https://hosvagyok.hu/userfiles/file/pobijizu.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/f017fce6754473185f2379b36fcb5d3a/43727523494.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/welupusarit.pdfIn PDF document text
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/mija2uvqvp00hrtk4c66hohibu/sebutozeviwilatunaxubum.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608c03928d115---88304629964.pdfIn PDF document text
    • http://studioriboldi.eu/userfiles/files/nabavowenagimojituniz.pdfIn PDF document text
    • http://ledins.lv/cms/file/rujamakexetedisurema.pdfIn PDF document text
    • https://dnmpaint.com/sdcc/images/file/59102117770.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/xarotanutama.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160841e02131cc---veforagotepovoza.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e7faf0111a---83958156606.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbe8a55b6e---vemuvewarevadimafib.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/kt5qrcddvm9tu3fpgj11pmltej/nopelodexogadugipena.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160acf439d4bc3---97013998191.pdfIn PDF document text
    • http://arunimaflavours.com/userfiles/file/sukavobomorovusoru.pdfIn PDF document text
    • https://tecnibat.net/uploads/archivos/18015244694.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/k5eb7dl4vtcugkkni5nmsu8j63/luxejinopezozumazekub.pdfIn PDF document text
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/7ccb3b5738f3bbb34cc3c9976dcbb66a/94310708456.pdfIn PDF document text
    • http://slp72.com/clients/7/7b/7b902bee17765b19ebdde6030f24742d/File/dojam.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/2b804bbc4236327751e6c836a6dabc43/37352654233.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081515476d10---84847904682.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=in+jesus+mighty+namePDF 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_off00012770.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12770 10584 bytes
SHA-256: ed03bcebafe2ccb3a4f2abfe8f71e1693754866bf6cf472c0a29fcad17044a9b
font_01_sfnt_off00013f68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F68 17316 bytes
SHA-256: 14a1e195f24b12470c1c55086da6fe6bfb9cd20ae016bb9f595e756c60d9ffed
font_02_sfnt_off00016c7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16C7C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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