Malicious PDF — malware analysis report

Static analysis result for SHA-256 f18ce9a6226f4f0f…

MALICIOUS

PDF

86.8 KB Created: 2021-09-01 12:24:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 0f11f6addc1d5298028f997a7cb4d1c6 SHA-1: 42853f6082d76f65744c7fdff0230722d35dd206 SHA-256: f18ce9a6226f4f0fcbc9befee64d14e63376b13dc9cb84d4b7f5c677c5a9a719
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with several heuristics indicating it functions as a link farm. Some of these links point to compromised CMS upload directories, suggesting a tactic to host malicious content or redirect users to phishing sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://scavilecis.it/userfiles/file/38093926688.pdf In PDF document text
    • http://macap.nl/app/webroot/files/userfiles/files/24949604657.pdfIn PDF document text
    • https://dienlanhhonganh.com/images/pic/file/lozezorajoraduzexokoji.pdfIn PDF document text
    • https://tavio.ru/files/file/94889081822.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/jiu54vnbhrk75v3limjtj8jmj5/94565750694.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/2h4oacn1vkeh4sh559br130mf1/87121697415.pdfIn PDF document text
    • http://krishikhabar.net/assets/ckfinder/core/connector/php/uploads/files/moxaruvilos.pdfIn PDF document text
    • http://forter.vn/hinhanh/file/80526785331.pdfIn PDF document text
    • https://livstyle.ro/home/livstyle/public_html/uploads/files/wozinosamix.pdfIn PDF document text
    • https://eletroluz-al.com/_IMG/img_internas/file/webotigatel.pdfIn PDF document text
    • https://tezerwatch.com/file/upload/files/06-18-13-33-34-86.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/275l9ieqe81c4a65omeua5nfd2/60965088163.pdfIn PDF document text
    • https://ximatinhdongnai.com/app/webroot/files/images/pages/files/tabilotugofiwutukojapiw.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608bae2e6423b---deboranipufoputiduxaluj.pdfIn PDF document text
    • http://nagymester.com/userfiles/file/27265603835.pdfIn PDF document text
    • https://www.helmmsp.ca/wp-content/plugins/super-forms/uploads/php/files/3df7caad5f6e99d183d20e1b975975bb/jedenubuwazewagafanu.pdfIn PDF document text
    • http://hacoauto.vn/upload/files/18385442266.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/4226940da253fef9f500d0766bad3567/bazulalebegedalinuj.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa54d166a21---81449558915.pdfIn PDF document text
    • http://coffee33.ru/archive/file/18581379053.pdfIn PDF document text
    • http://hrzservices.com/uploadfiles/file/wijevurotijezopin.pdfIn PDF document text
    • http://agama-rc.com/upload/files/tulewijorapupuvumexilotis.pdfIn PDF document text
    • http://millecolori.it/images/file/foxopemov.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=the+age+of+earth+is+estimated+to+bePDF 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_off0000ef0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF0C 10756 bytes
SHA-256: cf071074c6251ba7d71c4b06bb01bfea6bc8ef2ce885bd78252df7b15f4447ba
font_01_sfnt_off00010797.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10797 17656 bytes
SHA-256: 4ff3043124a878e1d550667e77d771c7cb7f1f36dc29a5eaa73809fbd2f3f83e
font_02_sfnt_off00013515.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13515 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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