Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fe20a3aaa3db92f…

MALICIOUS

PDF

75.9 KB Created: 2021-09-07 01:42:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5680109ceafa4d993f80b403cf799b73 SHA-1: 925e9171669f2aa80b75bc67b043c82c8b79b5a6 SHA-256: 5fe20a3aaa3db92fb86c1ebd9890e7534ebf529651487a6281a6e35c5e6fbf49
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, hosting numerous URLs on compromised or disposable domains, likely to redirect users to phishing sites or download further malware. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM firings supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://www.djluk.co.uk/wp-content/plugins/super-forms/uploads/php/files/pjtlnm87fo1lc28gftu085sfm8/farigurilofupowiges.pdf In PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1607589c4349f9---4543422918.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160ec408bd7e89---39235131307.pdfIn PDF document text
    • http://solar-makernavi.com/ckfinder/userfiles/files/faforofavotodupaferetis.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/160867779211b8---bizirofibozofolulizowabor.pdfIn PDF document text
    • http://chinalabware.es/d/files/dazubaw.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/86b350f6217e1b4b748d3591c32c235a/48020854036.pdfIn PDF document text
    • https://alsharqcc.com/userfiles/files/54863682653.pdfIn PDF document text
    • http://fred-robin.com/ckfinder/userfiles/files/liwevufasomolojezasupav.pdfIn PDF document text
    • http://mansiya.com/uploadfile/files/jafepab.pdfIn PDF document text
    • https://edarky.net/data/file/19244198916.pdfIn PDF document text
    • https://netwindowvn.com/uploads/userfiles/file/nubugujuxenet.pdfIn PDF document text
    • http://wabasnb.com/files/fckeditor/file/37545326160b1716160540.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133fc8452686---13127380487.pdfIn PDF document text
    • http://erictex.com/ufiles/files/1951294271.pdfIn PDF document text
    • http://ballmillfactory.com/d/files/47290812249.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088e330201b8---wurin.pdfIn PDF document text
    • http://wumag.pl/userfiles/file/23555401472.pdfIn PDF document text
    • https://securitydm.com/slicice/file/38568471515.pdfIn PDF document text
    • http://abacusnancy.com/userfiles/file/3446532020.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607a336cda697---790550707.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fc37e2763b7---vipunifumikuguxiwofidovit.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607dfed23321f---57738663891.pdfIn PDF document text
    • http://palakkadtourism.in/ckfinder/userfiles/files/movizatibikugobadawanimaw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=science+apparatus+worksheetPDF 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_off0000bb25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB25 20768 bytes
SHA-256: 1a0438d9f710e70dc9ab888bc65bf0a52e7cfe94aa9c20807da4c7c789131d79
font_01_sfnt_off0000f163.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF163 10776 bytes
SHA-256: 267f7ffa0f4f685fa66c3336d64ef622eb08aaebc1d1e8425a6a2a3bed3b2df4
font_02_sfnt_off00010a3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A3E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1