Malicious PDF — malware analysis report

Static analysis result for SHA-256 01e8c0a6a49a00a9…

MALICIOUS

PDF

78.3 KB Created: 2021-09-13 23:23:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 05854d2aef36377e7b88a0ce0c255d81 SHA-1: e191ab30e6ae051ea64f5fb49c559401ed260194 SHA-256: 01e8c0a6a49a00a95a7666dd2b46c8f6ab8411febebc3cf4bebc50091257772a
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The file's structure as a link farm on potentially disposable hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/0cc61d3bd23b61713ebbe30f4f2213cc/45441990839.pdf In PDF document text
    • https://podiummagazinenews.com/ckfinder/userfiles/files/84727988860.pdfIn PDF document text
    • http://somkuthyoptika.hu/editor_up/21224015020.pdfIn PDF document text
    • https://decoveinvestment.com/userfiles/file/febonak.pdfIn PDF document text
    • http://wirheiraten.de/images/file/16213246241.pdfIn PDF document text
    • http://ana-jsc.com/upload/files/zegudatiriku.pdfIn PDF document text
    • http://mauchlineware.com/html/chapelstreet/web/userfiles/files/89270730281.pdfIn PDF document text
    • http://newdimension.su/userfiles/file/navosagegexukiz.pdfIn PDF document text
    • http://vegman-kzn.com/ckfinder/userfiles/files/vuxetorosiwejunut.pdfIn PDF document text
    • http://qamsar.org/userfiles/files/ratib.pdfIn PDF document text
    • http://capesociety.ca/uploads/files/zipimowidimilekan.pdfIn PDF document text
    • http://www.39koratmachinery.com/file_upload/files/47138234125.pdfIn PDF document text
    • https://cristalparkhotel.com/ckfinder/userfiles/files/46870587933.pdfIn PDF document text
    • https://bawaniint.com/ckfinder/userfiles/files/samifineta.pdfIn PDF document text
    • http://022-web.cn/uploadfile/file/20210912211055009.pdfIn PDF document text
    • https://bulendengin.com/upload/ckfinder/files/vaferazesimilagixer.pdfIn PDF document text
    • http://burelomdo.com/ckfinder/userfiles/files/sajerab.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613e6b358eee9---74995555883.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613113c1bdf8d---65530765243.pdfIn PDF document text
    • http://xn----7sbakn3aoflleitf3m6a.xn--p1ai/userfiles/file/sakevarupimovo.pdfIn PDF document text
    • https://www.groupe-coelho.fr/ckfinder/userfiles/files/xenibevizafogusutukobef.pdfIn PDF document text
    • http://fantasymusic.it/userfiles/files/7179281431.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/95k0onfl56lsbcmmun9kh8amcc/bamerinivomumut.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=slope+game+unblocked+gamesPDF 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_off0000cbc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBC9 18072 bytes
SHA-256: efaf99252881bfd63884d2277907e745009368b61a3604eff9a05d372cf62ac9
font_01_sfnt_off0000faf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAF6 10972 bytes
SHA-256: ee402b0db5618dbb7124c5a40b128cae95e52d2043caf18978ca9b8fe78db7ae
font_02_sfnt_off000113fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1