Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ff42d2bf3d13a5d…

MALICIOUS

PDF

77.3 KB Created: 2021-09-30 21:29:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: b94679eae86f2ca1651c6bdab4957c55 SHA-1: 3233b9cc073e12543b2b023ea0ded57857c90625 SHA-256: 7ff42d2bf3d13a5d89bf70cb6378b870f3a4b79afdd5beb6bf30cea9a5611c87
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, specifically related to phishing and link farms. The document contains numerous embedded URLs pointing to various domains, many of which appear to be compromised WordPress sites or disposable hosting. These URLs likely serve as a distribution mechanism for further malicious content or phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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=the+mountain+between+us+putlocker PDF link annotation
    • https://szallas-karpatalja.com/upload/83476082053.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/ca7e9fb26d2838bd27d81512327ec567/duwezukoruvusevuxikedivuw.pdfIn PDF document text
    • http://aktifithalat.com/resimlerfiles/82098287182.pdfIn PDF document text
    • https://aydin-elektrik.com/resimler/files/9425287068.pdfIn PDF document text
    • https://ukmalayalamnews.com/userfiles/file/89200915178.pdfIn PDF document text
    • https://cpsguffanti.it/uploads/file/23992017631.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/2cc47f1a203ef356883dc18e89b204a3/dogedixegom.pdfIn PDF document text
    • http://studiodrago.eu/userfiles/files/zezajedopirusav.pdfIn PDF document text
    • https://fo-prefectures.com/pages/files/vululud.pdfIn PDF document text
    • https://costabravas.com/uploads/localidades/files/66881069501.pdfIn PDF document text
    • https://kingbakerypans.com/userfiles/file/80822162475.pdfIn PDF document text
    • http://wawa757.com/uploads/files/wililus.pdfIn PDF document text
    • http://ooexperience.be/assets/Image/files/lipamexifugili.pdfIn PDF document text
    • https://isagrinio.gr/userfiles/56185483114.pdfIn PDF document text
    • http://zdravi-kromeriz.cz/files/file/boxaladawuroxalowatuvox.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/16155e6e7e5e91---palobujagomaliropodu.pdfIn PDF document text
    • https://bostoncake888.com/UserFiles/files/64647313294.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137609d237ed---zizozisatodakokifopu.pdfIn PDF document text
    • http://szybkieprawko.pl/szybkieprawko.pl/user/admin/fck/file/pibilavifenotadizireduk.pdfIn PDF document text
    • http://ros-audit.com/i/up/file/86989400288.pdfIn PDF document text
    • http://svenskafik.se/uploads/fckeditor/file/lekawuder.pdfIn PDF document text
    • http://techscreening.com/userfiles/files/91245449311.pdfIn PDF document text
    • http://ohdiabo.net/images/ckeditor/files/44078087638.pdfIn PDF document text
    • http://articolo17.it/siti/usr/foto/files/44315027528.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_off0000c123.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC123 19452 bytes
SHA-256: 25ac04f35ab2ba26f0b6bde95f67590f5efbf5913f762a6e96c6ba79bf82ac06
font_01_sfnt_off0000f427.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF427 11020 bytes
SHA-256: 7e77c6aaf8af7f86c292ca4eb4d2af9e4923554f9c631d3f68a2ba50f6623975
font_02_sfnt_off00010d72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D72 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1