Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bc860778977bc0c…

MALICIOUS

PDF

82.4 KB Created: 2021-09-01 19:27:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 493ea572e83475b6e5f31bf672a29490 SHA-1: e356be52c90dc4dd58424093f0af2b96bd6a7f74 SHA-256: 1bc860778977bc0c49ff722e1404e4a32a1e51dec050d3f9912f30fa491eb8ed
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and link farms, many pointing to compromised CMS upload directories, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the nature of the links and the detection results point towards a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://crewmak.ru/uplcv?utm_term=sweating+too+much PDF link annotation
    • https://bahceneryaman.net/public/content-images/files/24485471402.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f5cf2ac7d8---xubufux.pdfIn PDF document text
    • https://em.heephong.org/ethnicminorities/cmsadmin/ckfinder/files/91458426372.pdfIn PDF document text
    • http://lakehighlandsrw.org/clients/863582/File/74160372723.pdfIn PDF document text
    • http://lnaixi.com/userfiles/file/20210828220549_1048780271.pdfIn PDF document text
    • http://binhchuachay.info/Images_upload/files/70391008286.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/878678a2b843e3d70fbc01b322f1d98d/zedenaxiwedorub.pdfIn PDF document text
    • https://digireg.cz/upload/ketedanibow.pdfIn PDF document text
    • http://selfmadefilms.nl/userfiles/files/8148025972.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609a525dcd5f4---ponesofiropuva.pdfIn PDF document text
    • http://hifi-markt.info/kunden/kronhardt/ckfinder/userfiles/files/denowogoruvumomitujev.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee4be202ee8---zumazidawepofosirefeb.pdfIn PDF document text
    • https://jordan.si/dokumenti/file/limifa.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/a1c8cc8d7f8ecf97827f6174e8f1817d/gesajoxosanubuz.pdfIn PDF document text
    • http://massintech.ru/img/outer/files/ketubirakiwinidonobidas.pdfIn PDF document text
    • http://cuanhuadanang.vn/uploads/image/files/bisulokabave.pdfIn PDF document text
    • https://questyme.ca/userfiles/file/57061941238.pdfIn PDF document text
    • http://mobitransjogja.com/files/fujetebu.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/aa045b2eef8122526b72ed98f35d5d2e/pularamuwuvonedine.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160812db575dc5---79438228532.pdfIn PDF document text
    • https://aglogistics-bo.net/userfiles/file/xoketivasasulajo.pdfIn PDF document text
    • https://towa-aaa.jp/userfiles/file/gudogajugenibapapenolaxer.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_off0000db36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB36 10624 bytes
SHA-256: ba38ede3bc3db4778ede16b8dc5f6ab4e35186033197159319d620877de2ca1e
font_01_sfnt_off0000f36a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF36A 18744 bytes
SHA-256: 353c1cfa38bd7ba5f8f44abbd88c95e69927c6e1eafc37a4fce9512ccd83daa6
font_02_sfnt_off000123ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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