Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3816293333d4eb7…

MALICIOUS

PDF

86.9 KB Created: 2021-09-09 17:29:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 40a4d5ec81aeab544fed66e9e8e93e13 SHA-1: 6748dbd079f6b40da80614f592c258c7baf995ef SHA-256: e3816293333d4eb73c8d6834fad2ecfa4947d1146e0e19e76f6b76f816f2abec
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the PDF structure itself is used to host the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://irlanc.ru/uplcv?utm_term=how+to+transfer+pictures+from+android+phone+to+computer PDF link annotation
    • http://arsvet.ru/img/upload/zegikuwojufib.pdfIn PDF document text
    • http://www.chiringuitomediterraneo.com/ckfinder/userfiles/files/40719111422.pdfIn PDF document text
    • http://tiszaikaland.hu/upload/file/luvunubifiwanodasi.pdfIn PDF document text
    • http://parzenica-bialka.pl/userfiles/files/703416934.pdfIn PDF document text
    • http://chapaconoticias.com/assets/ckfinder/core/connector/php/uploads/files/wamiwemejijekegedamuri.pdfIn PDF document text
    • http://kimhoatra.com/upload/fckimagesfile/38599454529.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1613362c2b3a10---48546090219.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/161396d1300c37---pefezu.pdfIn PDF document text
    • http://hoteldarim.ir/basefile/hoteldarimir/files/62074301994.pdfIn PDF document text
    • https://yptea.com/data/fckeditor/files/95113873780.pdfIn PDF document text
    • http://zhymwz.com/upfile/file/26836004917.pdfIn PDF document text
    • http://thongthien.vn/upload/files/28441375394.pdfIn PDF document text
    • http://hoadon-dientu.net/images/files/50241943996.pdfIn PDF document text
    • http://gojjang.com/uploads/files/nadoroxo.pdfIn PDF document text
    • https://ginniglobal.com/uploads/file/kurifedefe.pdfIn PDF document text
    • http://edituj.cz/res/file/vipozeritukenakasojaxij.pdfIn PDF document text
    • https://www.casestilistas.es/ckfinder/userfiles/files/97947237923.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/1ba7611d6c75494d54106fb673188609/48996092464.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/16136ce8e0d711---62783471481.pdfIn PDF document text
    • https://textmakareknutsson.se/upload/image/dovikag.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612e9d2c20ad0---fivexidazavujupaduw.pdfIn PDF document text
    • https://amigo-shop.105h.net/upload/files/13269253932.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/fff8bf601b1a2cc023b552422363ec5f/wafimerijifukilanomaniti.pdfIn PDF document text
    • http://accessibilite-salle-eau.com/ckfinder/userfiles/files/gadarokujupavawew.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_off0000efa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA8 11016 bytes
SHA-256: b9512f7c06f9040245f01b538b9bfb00f2bd3aadec465843edc84b67029ec7cd
font_01_sfnt_off00010918.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10918 17204 bytes
SHA-256: 83347466f6f298ad93862b9b775d418d6430185098375da6567e7f7baff50f7e
font_02_sfnt_off000135a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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