Malicious PDF — malware analysis report

Static analysis result for SHA-256 70aa9c90701611ae…

MALICIOUS

PDF

77.4 KB Created: 2021-08-01 13:16:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 4237ce7ac633104a1059702e672951ed SHA-1: f12f16e1d0b00ed6f96cb16e008e485f5ea9ba7b SHA-256: 70aa9c90701611ae7e792e76af46f0027dce17b0270072295ddb46e7f4c34394
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs that point to compromised websites and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://queure.ru/uplcv?utm_term=euphoria+subtitles+download+subscene PDF link annotation
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/15ca40ed7a4fb22e7aa8d8a95713819c/62988596837.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/wapikowexidibek.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606cce5926879---soxer.pdfIn PDF document text
    • http://busangh.com/attfile/fckimg/file///2021061823146_616772750.pdfIn PDF document text
    • http://palami.by/images/file/fekitixavapezon.pdfIn PDF document text
    • http://alacarte-design.de/userfiles/file/dufefo.pdfIn PDF document text
    • http://sbkf.org/files/files/satilafemulixojawup.pdfIn PDF document text
    • http://sushikyototogo.com/uploads/files/37864499898.pdfIn PDF document text
    • http://moriefrusca.com/userfiles/files/6918918770.pdfIn PDF document text
    • http://merwepizza.com/upload/file/vasemunotobozefi.pdfIn PDF document text
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/thlprqfs84aij6eta3dg5gbnvr/govogimalazobozewegoxaw.pdfIn PDF document text
    • https://glaze-metalart.com/upload/files/42299693235.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606d397b98e9a---mujapokefekudizusod.pdfIn PDF document text
    • http://protok.pro/upload/files/xaxikav.pdfIn PDF document text
    • http://canyonoaksmtg.com/~duckdi5/canyonoaksmtg.com/content/file/kuterutolagofut.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4112205d1c---20526643830.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/d9cbbdcd6b08ac666d1a7d687036b365/miriwipavifuwa.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/520aec227c332b57cda564f6c5abda55/36125291422.pdfIn PDF document text
    • http://www.chp.pl/ckfinder/userfiles/files/vuvutibuxul.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/qr6f8ak0ca65vs9pftts6afp42/sanuwura.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/mqq746euf7495560kv60mu3q43/38251022851.pdfIn PDF document text
    • https://vydavatelstvoklett.sk/userfiles/file/33895704327.pdfIn PDF document text
    • http://thekitchendesignstudio.org/uploads/files/davafet.pdfIn PDF document text
    • http://www.euro-fly.eu/userfiles/files/nojolaniwefasologiveguge.pdfIn PDF document text
    • 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_off0000c9be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9BE 16880 bytes
SHA-256: 23c2e3d65d4f37424a142d3bd78af0d8f18cbdeb86960b503b8a7f882b89bad6
font_01_sfnt_off0000f5ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5EA 10920 bytes
SHA-256: 6237954b39eea83a8ea57cd7ce8edb6520fa756bae8633b0ac762e2ddb03e946
font_02_sfnt_off00010ef6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EF6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1