Malicious PDF — malware analysis report

Static analysis result for SHA-256 c806979f88709731…

MALICIOUS

PDF

80.7 KB Created: 2021-09-06 18:01:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: a52a3098512eded7aacc2af7ba1e7a81 SHA-1: 7307702b7b24d3d533b5e01a0f822a5e7b985249 SHA-256: c806979f88709731cfdbacfced1b51871aa3ee1f4394644b5015cbd29623392e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://chcial.ru/uplcv?utm_term=sabbath+school+lesson+pdf+download+2019 PDF link annotation
    • https://hongmao.tw/uploads/files/202109042322099491.pdfIn PDF document text
    • http://whkmradio.com/userfiles/file/68337143697.pdfIn PDF document text
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160aa5aba6367c---madewudim.pdfIn PDF document text
    • https://ndmoyun.com/calisma2/files/uploads/wivinef.pdfIn PDF document text
    • http://vigen12.com/userfiles/file/189410329.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fec5cd73ff---veguzutigukoxixipoli.pdfIn PDF document text
    • http://ghalemdi.com/userfiles/file/15473413304.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/3beoc7gb80e3nnqahsdg5f26uf/64438902130.pdfIn PDF document text
    • https://daynexweb.com/upload/ckfinder/files/maxeziremanezuwi.pdfIn PDF document text
    • https://jyapa.com/jhuoyue/uploadfiles/kosar.pdfIn PDF document text
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/40270079591.pdfIn PDF document text
    • https://mgs-on-track.com/uploads/misc/files/taxusul.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/765d014701873e1705b46ee45d7005fc/53945341568.pdfIn PDF document text
    • https://allcondosales.rodeodrivecondosale.com/userfiles/files/vagavupumuboseraboxafow.pdfIn PDF document text
    • http://www.apsetedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb82ed2e08---5955969712.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/587f5c8e4e22e150408ea016026b253f/62307500295.pdfIn PDF document text
    • http://forumcutuca.com/ckfinder/userfiles/files/wisasagexeso.pdfIn PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/5a86c449906ad558ef2d91b9085b5470/44558174529.pdfIn PDF document text
    • https://tidaksusah.com/contents//files/gowaxoko.pdfIn PDF document text
    • http://adhdesign.de/userContent/files/20210816011936-18547866775.pdfIn PDF document text
    • https://intervalhousehamilton.org/ckfinder/userfiles/files/maxabugavupufojezenok.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160b6ba758a879---70389962688.pdfIn PDF document text
    • http://sp2wronki.pl/fotki/fotki/file/7199901118.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_off0000d67d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD67D 11288 bytes
SHA-256: 3bb439a242249b6535fe3910f1eed37a85d9dc45b3c4eaf9cc2b0330bedf3c65
font_01_sfnt_off0000f0e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E2 17244 bytes
SHA-256: 63289b790e259fd29bc1239b36ebeebd8be998cdb86b07017989d4793b4e60c1
font_02_sfnt_off00011d33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D33 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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