Malicious PDF — malware analysis report

Static analysis result for SHA-256 6455ca05f8592fac…

MALICIOUS

PDF

78.4 KB Created: 2021-09-07 19:36:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 6429038efb79f927c573fcf1995f66cb SHA-1: 68a6c7cc7a1051c4953b13c17f44e9fec26cb193 SHA-256: 6455ca05f8592fac617fc52d91631f4b5123cb9fe0a51a2f06b5a5242060c633
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was flagged by ClamAV as a phishing trojan. It contains numerous links pointing to compromised CMS upload directories and disposable hosting, suggesting a link farm designed to distribute malicious content. The ML classifier also strongly indicated maliciousness, and the presence of embedded URLs supports the attack pattern of luring users to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://aquafilling.com/userfiles/file/61071908401.pdf In PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/1611edfa3265d1---39763775218.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/2cd4d6cf96f5adb77a4cf7e0dbce8ca1/54449419030.pdfIn PDF document text
    • http://tramtronbetong.com/uploads/userfiles/file/vejusenetijatulinigiledok.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa3322e6755---4634143409.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/98f633806f27a89de711c9892291dcec/begarogekuwagen.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/oa0rs4uhb9ukgaeqkbibbri20s/27991488014.pdfIn PDF document text
    • http://planbmedia.hu/files/845240343.pdfIn PDF document text
    • http://xn--e1aaafipco3bk8gra3b.xn--p1ai/upload_picture/file/wixijimesuve.pdfIn PDF document text
    • http://boothbayharborshipyard.com/userfiles/file/sejovuzilawozipenuwus.pdfIn PDF document text
    • http://reelproductionshd.com/userfiles/file/74771061786.pdfIn PDF document text
    • http://mim2010.ru/userfiles/file/17574417531.pdfIn PDF document text
    • http://emeat.ru/var/files/dupanisulafunamawepew.pdfIn PDF document text
    • https://bostoncake888.com/UserFiles/files/2311491291.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1612bc2492c3cc---nerejekutamijanunomexesow.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160feb48b7a0d4---nuvudenezolikisawo.pdfIn PDF document text
    • http://rpsbchamber.org/editorData/file/40488896341.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1606c79a3bf70b---36950172401.pdfIn PDF document text
    • http://mstreatmentadvances.com/userfiles/files/48202295553.pdfIn PDF document text
    • http://jcbcharpentebois.com/ressource/site-image/files/58428488628.pdfIn PDF document text
    • https://nepalaviationmuseum.com/userfiles/files/pexiro.pdfIn PDF document text
    • https://daismene.it/file/32635801619.pdfIn PDF document text
    • http://szao-spb.ru/images/news/file/tidakomizawatuwar.pdfIn PDF document text
    • http://poliinc.com/upload/files/23608239801.pdfIn PDF document text
    • https://institutdesante.org/userfiles/file/4164944544.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=flir+iphone+camera+manualPDF 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_off0000d1a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1A5 16856 bytes
SHA-256: 0a17e39598ffc747dafd74b73795b26fc1412fb2e7ab4e1db48fbd669dac1b53
font_01_sfnt_off0000fcf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCF6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001150d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1150D 10448 bytes
SHA-256: 60261796347dbc72834670174bbb8a65be8da26753a447719cd5624a34474ab5