Malicious PDF — malware analysis report

Static analysis result for SHA-256 805bf846ae486987…

MALICIOUS

PDF

78.2 KB Created: 2021-07-03 15:35:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: b6bdd502c0f7264b9caf42bdad9125b5 SHA-1: 5f71727f3fa92f1a6463b71a0e7c993dfeaa4ba4 SHA-256: 805bf846ae486987f18c32f635a4fd6870d0520f15b63c63f35e818882ae6028
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm, with many URLs pointing to compromised CMS upload directories and disposable hosting, suggesting a phishing or SEO manipulation scheme. The embedded URLs are likely intended to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/2e9f30be41187290b992956121406c5e/13926830759.pdf In PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/01baa2b89ae31fd0d95b9df3fc3e6819/10672018865.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/nib4arfm8dn2afbi3mh3n3qb20/66785157272.pdfIn PDF document text
    • https://prospr.fr/ckfinder/userfiles/files/gapabenogetenegiguzejusij.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609ec53966681---75751756390.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/pogaguposenetoripuzuxof.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16071a52467bc4---29718324680.pdfIn PDF document text
    • http://fairview66.org/clients/866114/File/2968144758.pdfIn PDF document text
    • http://wojno-stal.pl/pliki/file/55465959919.pdfIn PDF document text
    • https://arichaindia.com/userfiles/file/nejenijeredesalezul.pdfIn PDF document text
    • https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/9ec1b3352b752f4d6afbb3a9cdc36a2c/nitexilogivina.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aaa3fc6654e---lekisagozawinulagolopiku.pdfIn PDF document text
    • http://www.evisiontiendaonline.com/ckfinder/userfiles/files/73350276929.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/df951036d415a3b8e1255297fe316b81/ridizal.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607aed6ea2c0a---kolakikebelozoleko.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afea585629b---duligetatalorupivakerepa.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/vivimukagudemufi.pdfIn PDF document text
    • https://abhimaninteriors.com/ckfinder/userfiles/files/nujuvomib.pdfIn PDF document text
    • http://zamokugrofa.sk/admin/fckeditor/file/39739292571.pdfIn PDF document text
    • http://ya-ke.cn/admin/upload/risifovigokirarilip.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/f738fb6c552c3499e01f9cfdf8ec502f/vogalavorozaniwilimevad.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/160863a94184a2---10821308587.pdfIn PDF document text
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/dkerhu1fnm37lbmj8sf9abqo74/difabivavunoniburarek.pdfIn PDF document text
    • https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/880e3ae618ae7ff55e96ad7128e4f3aa/67878711777.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608ff2ac3bd93---fezafikewatox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=0.5+mm+to+awgPDF 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_off0000cedb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEDB 10120 bytes
SHA-256: 86128964551919d4c1ee6ba29805863bb8268a0e6597aff6a4a056f86b43d6f9
font_01_sfnt_off0000e58d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE58D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fd9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD9F 18468 bytes
SHA-256: d6bad1025e39a501ba8df787cc7f595cd5e5caa02570f0932623897904def55c