Malicious PDF — malware analysis report

Static analysis result for SHA-256 9089b70c69b58d8d…

MALICIOUS

PDF

82.7 KB Created: 2021-09-10 12:18:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d9a3f71057af14c7ca8549666fe808a3 SHA-1: 8c9f1064de3182194000a1904c60c979b2fec47e SHA-256: 9089b70c69b58d8ddce86792d3a4791dfe9c9e153cfa30a1498db478f9d478f8
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and unreadable, preventing a more detailed analysis of its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://sxsasa.org/images_fck/file/1630729110.pdf In PDF document text
    • http://cbestdesign.com/ckfinder/images_store/files/49138763371.pdfIn PDF document text
    • http://fotocaroli.it/userfiles/files/14748749458.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1613a92a4863e7---83815511927.pdfIn PDF document text
    • http://rentbucharest.net/images/userfiles/44207783000.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/6e74a83b20370494a1d7129189fe5834/32772670307.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613780b459c1e---89087592398.pdfIn PDF document text
    • https://resicolor.com/upload/files/redigok.pdfIn PDF document text
    • http://www.extramas.com/userfiles/files/43542833974.pdfIn PDF document text
    • http://kubabus.cz/novy-web/upload/file/65359639316.pdfIn PDF document text
    • http://kayapalinakliyat.com/file/zewabakiru.pdfIn PDF document text
    • http://zoo-foto.cz/userfiles/file/50486286440.pdfIn PDF document text
    • http://wxmx.cn/upload/ckimg/files/202109011421307666.pdfIn PDF document text
    • http://jhdljz.com/userfiles/file/1630909373.pdfIn PDF document text
    • http://www.gamylai.vn/uploads/files/rofofarokakodu.pdfIn PDF document text
    • http://marjoleintje.nl/include/userfiles/situzod.pdfIn PDF document text
    • https://fototipia.hu/files/files/18009154063.pdfIn PDF document text
    • http://zajazd-broadway.pl/galeria/file/jiketodonerodataroru.pdfIn PDF document text
    • https://www.frontiermyanmar.com/sites/all/libraries/ckfinder/userfiles/files/pegulezotefadapalor.pdfIn PDF document text
    • http://taiwan-tsai.com/upload/files/putoxodemef.pdfIn PDF document text
    • http://joinsocialbubble.com/cake/beta/userfiles/file/74558145185.pdfIn PDF document text
    • http://isspskola.lv/userfiles/files/74630476622.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/q4487635jjbntdf40ed5ik3sdr/zesusaxilizurimogawa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=microphone+live+apkPDF 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_off0000dd99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD99 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f5ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5AB 18508 bytes
SHA-256: d1b9e3c9c5943864f62e170eb2b9d7a3eb00055cded98065568b63d2a9c15f66
font_02_sfnt_off000125f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125F0 10356 bytes
SHA-256: 01f52a8b60e98ca9900ef6ee18f203b19f21af422c7b55558e14c74fcd41b978