Malicious PDF — malware analysis report

Static analysis result for SHA-256 275c3971daf70730…

MALICIOUS

PDF

76.4 KB Created: 2021-09-24 05:58:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: cf85509f3d02337fabefdc743f231b4f SHA-1: 259d876518d9400934acd227856e9caf82c71639 SHA-256: 275c3971daf70730f99031b20b2e18f129fc6441a43103df0ef5877bea83abac
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a link farm pointing to multiple disposable hosting sites, which is a common technique for distributing malicious content or phishing lures. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' suggests the document may be instructing the user to open a password-protected archive, a tactic to bypass gateway scanning. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://dursunguney.com/userfiles/files/numuxisomakerexe.pdf In PDF document text
    • https://citytrafik.nu/images/file/98590346633.pdfIn PDF document text
    • https://safetyhanoi.com/userfiles/file/ximararakeguwideleselajek.pdfIn PDF document text
    • https://path.mn/userfiles/files/68820416205.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1614d0f8f7f5ff---sesiwom.pdfIn PDF document text
    • http://www.rupankar.com/fckimages/file/57370560909.pdfIn PDF document text
    • https://kltccompany.com/ckfinder/userfiles/files/fujetolan.pdfIn PDF document text
    • http://studioingegneriavaragnolo.com/userfiles/files/xatevemosuduvudeterulezer.pdfIn PDF document text
    • http://teen.plovdivweek.com/js/ckfinder/userfiles/files/6197290074.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/8307aa3571dbff7a55b76a573815c247/wuxusaver.pdfIn PDF document text
    • https://moderator.lt/components/com_mijoshop/opencart/image/data/files/91052626080.pdfIn PDF document text
    • https://viceda.com/userfiles/file/bogomisenaraberirukiwakal.pdfIn PDF document text
    • https://globalcircle.club/userfiles/file/52382854599.pdfIn PDF document text
    • http://dyglas.com/userData/board/file/46685343322.pdfIn PDF document text
    • http://dentalweek.eu/userfiles/files/69146598279.pdfIn PDF document text
    • http://espwireless.net/uploads/file/vugekubududedumobuv.pdfIn PDF document text
    • https://markapin.com/calisma2/files/uploads/jinupusajonab.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/i0mhf7djbjsu8draoknl8kvds0/43996753606.pdfIn PDF document text
    • http://domingo.hu/ckfinder/userfiles/files/wikigubodelagupo.pdfIn PDF document text
    • http://hawaiianhunareiki.it/file/nilatatepevepasobuxoda.pdfIn PDF document text
    • https://tselectromechanical.com/uploads/CKfiles/files/xafadudekuworerekol.pdfIn PDF document text
    • http://cieplej.pl/imgturysta/file/zixuzigonifafajo.pdfIn PDF document text
    • https://ev-owners.jp/userfiles/files/29798419011.pdfIn PDF document text
    • https://terracell.pt/images/file/69396840492.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=handbook+of+fluid+dynamics+pdfPDF 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_off0000c78c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC78C 10888 bytes
SHA-256: bc22fbb2c491adb4b0ff27f9a432ba5c42bec5d3c3d80ee892e54acf643e68a1
font_01_sfnt_off0000e066.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE066 16828 bytes
SHA-256: 461997282c61b1b50838340781336e1346fc0c62bfab5f331b12a1b01d972bdf
font_02_sfnt_off00010bf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BF0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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