Malicious PDF — malware analysis report

Static analysis result for SHA-256 d388810bfe5fbaa1…

MALICIOUS

PDF

95.7 KB Created: 2021-09-08 10:16:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 27ec36bd0a750e51ab3b15ac08d35ccb SHA-1: 60422b99919829e1d4fbf5c4fcaf68574cb6c398 SHA-256: d388810bfe5fbaa1546bbe66b1d5edfb1a1c091a64c7d3caab9f40ccca78e5c1
124 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs that point to various websites, many of which appear to be compromised or used for hosting malicious files. The ClamAV detection and heuristic firings indicate this PDF is designed to lure users into clicking these links, likely leading to phishing or malware downloads. The file's structure and URL patterns suggest it functions as a link farm to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier clean score 0.1206

Heuristics 5

  • 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
  • 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://cructi.ru/uplcv?utm_term=the+overcoat+nikolai+gogol+pdf PDF link annotation
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/f904d5ff70b85a9c3127f06326e12985/81286142751.pdfIn PDF document text
    • http://csc-021.com/userfiles/file/20210624070509_frlgn3.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/olc1ujmlban98ev96kgjudd102/40933872541.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/e456400138a4aada533a5657bab4a618/50862585038.pdfIn PDF document text
    • http://kgmda.com/upload/files/41107386697.pdfIn PDF document text
    • https://zlato-eu.cz/upload/files/lileleroz.pdfIn PDF document text
    • http://haki.vn/uploads/files/11017464246.pdfIn PDF document text
    • http://zuche0551.com/upload/file/915381911.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/e01fc9db7074589e015112b5feaefa54/42544730710.pdfIn PDF document text
    • http://jiuxingchaoshi.com/uploads/file/212137292416.pdfIn PDF document text
    • http://yokohama-model.com/userfiles/files/nonogi.pdfIn PDF document text
    • http://jumpinfit.it/userfiles/files/85491908144.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/6204d2f30f10d8f2bc010f52fcfa529c/mupolevadugadusoliberuze.pdfIn PDF document text
    • http://afayl.com/userfiles/file/88866611665.pdfIn PDF document text
    • http://paroissedementon.fr/upload/files/katilasawevokibuka.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16106c0d401de0---bakikudubezixekizize.pdfIn PDF document text
    • http://charontrade.hu/data/file/betusifoz.pdfIn PDF document text
    • http://ventss.ru/userfiles/files/28770443059.pdfIn PDF document text
    • https://equalitas.es/userfiles/file/nudopa.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16073e3573fffb---mesavutixusavodofig.pdfIn PDF document text
    • https://sanruouvang.net/images/uploaded/file/61218787576.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16073710d49b8c---14881374988.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/2b96ba8p2h4t6cnvdpi7gk0d81/74863247121.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e220dc65880---kilewebipozel.pdfIn PDF document text
    • http://www.apsetedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160741adbbc1f8---lujemap.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/cab9143f758d33ff34b15f048dfa95e4/sodemebenotudanagin.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001348a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1348A 10852 bytes
SHA-256: 1aa5f88a9a80ad14a8d49f2e77fc1ed9085cb52bff3401034fab5a0c737e479c
font_01_sfnt_off00014d5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D5A 18008 bytes
SHA-256: 8cb1234698ecd6208764bb1e487fb195de76383286885efecfbff4d6d052f800