Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a43d8140d3899b2…

MALICIOUS

PDF

180.6 KB Created: 2021-07-18 08:23:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 67b4779f30eab17be8cbd2628a4d420e SHA-1: f50ca8cbb758f059ba03db882f8b2bbec3f3c7e2 SHA-256: 6a43d8140d3899b2cf9c963b0d38901412a6cbd367d0baeb643a60527c6624ef
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF that contains numerous links to compromised websites, many of which host further PDF files. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates that the document likely instructs the user to open a password-protected archive, a common tactic to bypass security scanners. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/b07ee1fcd94142408fcb19a48ab3d2dd/65110123561.pdf In PDF document text
    • http://www.teeintact.com/admin/fckeditor/editor/filemanager/connectors/php/img/file/5204808828.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608f90d1ae367---wonenebasovilugopofime.pdfIn PDF document text
    • https://avphunter.ro/ckfinder/userfiles/files/96562494803.pdfIn PDF document text
    • https://protectname.xyz/whoisprivacy/userfiles/files/72542803699.pdfIn PDF document text
    • http://kroonzuivel.nl/ckfinder/userfiles/files/togogevixo.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160b45e3fe737f---xunepivefupiz.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/1609072fab0ec5---zuralozifobapor.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/winosajirogitadifivo.pdfIn PDF document text
    • http://yaeram.com/userData/board/file/69913191147.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/b0249495e530acded1557f857fc39504/73715348717.pdfIn PDF document text
    • https://thinkglobalcompliance.com/ckfinder/userfiles/files/80692508605.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/bcnib7vc8ol527tmbtgep9tack/malamavugirimiz.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/c7c7c43fe12e6d1b3a3664c7857d2143/dodenefar.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/4jnca1sqm76tgogvurgp14dn81/zuzupalegeve.pdfIn PDF document text
    • http://minhvuongthuphap.com/upload/ck/files/figax.pdfIn PDF document text
    • https://kenadong.com/contents//files/84558610211.pdfIn PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/16b1f7722e4b907a5b072d002a2d6d0f/razafemofelilowoguji.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d0834f15f1---lazofowolagebuge.pdfIn PDF document text
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077070a40a3f---laguzaja.pdfIn PDF document text
    • http://xn--h1aaebajlcgx.xn--p1ai/sadm_files/kerekugobov.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/7714e57367f27b204be95588e85612d3/mufuxa.pdfIn PDF document text
    • http://ats-dz.com/userfiles/file/11979738947.pdfIn PDF document text
    • http://chargers68-50th.com/clients/3/3d/3dd154274af4887fbe356f6dcfc18689/File/7774038234.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=solution+manual+and+test+bank+for+textbookPDF 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_off000262f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x262F5 11024 bytes
SHA-256: 187d165b1d5e55f56a7d1d97d6d43ef288f9056233136b6673785890983803d9
font_01_sfnt_off00027c8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x27C8D 17968 bytes
SHA-256: d46544a2d0c551fc1f32d2a0e62501de4d7438de669313ae3803642a1a1f01f9
font_02_sfnt_off0002abfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2ABFC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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