Malicious PDF — malware analysis report

Static analysis result for SHA-256 20866c99bf9346aa…

MALICIOUS

PDF

79.6 KB Created: 2021-09-13 16:59:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e796bc2c7c8926567fffb2fd87362322 SHA-1: 1f9f1bf2173bcb588a32ca92023094c0d28eb9a9 SHA-256: 20866c99bf9346aa3b7ee193f576f11fd101a8435904fad01e06733fa1d728b9
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Numerous heuristics point to the PDF being a link farm, with many external URIs pointing to potentially compromised or disposable hosting. The presence of multiple PDF link farm indicators and the overall structure suggest a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://visualmotion.nl/uploads/file/tovaxutawodire.pdf In PDF document text
    • http://iswii.net/ckfinder/userfiles/files/46549306494.pdfIn PDF document text
    • https://cytokin.ca/upload/editor/file/sexeken.pdfIn PDF document text
    • http://yuli-china.ru/d/files/98561995467.pdfIn PDF document text
    • http://celesteandtorsten.wedding/images/file/zurusibexamogan.pdfIn PDF document text
    • https://fasleh.net/Files/files/wolunadifixodijanuka.pdfIn PDF document text
    • https://norservis.com/files/files/xarugufidupes.pdfIn PDF document text
    • http://ckrestaurantgroup.com/ckfinder/userfiles/files/36717585865.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/5645tll28p7bcg5lq5l4d3hs54/37195756804.pdfIn PDF document text
    • https://mimzyonline.com/userfiles/file/girix.pdfIn PDF document text
    • https://ichapps.com/ichapps/ckeditor-ckfinder-integration/uploads/files/56647862612.pdfIn PDF document text
    • http://coytex.net/ckfinder/userfiles/files/25418163844.pdfIn PDF document text
    • http://prospekt-rostov.ru/ckfinder/userfiles/files/46357162973.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613266b334f54---guzagumokevizafunijakupes.pdfIn PDF document text
    • http://zapatosperezcabrera.com/ckfinder/userfiles/files/ruwusatakezifili.pdfIn PDF document text
    • http://1careglobal.com/upload/files/30596003259.pdfIn PDF document text
    • http://xn--hh0b97d8is16e.com/userData/board/file/sivozomu.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/d73b70fc52c7948bca0453efa0bd66db/64861012462.pdfIn PDF document text
    • http://africareview.in/userfiles/file/dukelapig.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613729c506cd3---37577777304.pdfIn PDF document text
    • http://ramenzoni.eu/userfiles/files/72320022293.pdfIn PDF document text
    • http://ankurgroups.com/userfiles/file/gumadijuwosavatu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=skin+tools+free+fire+iosPDF 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_off0000d48f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD48F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eca1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECA1 17632 bytes
SHA-256: b71280c62d207fe3b2ce7c9c63ba267097de2e220bac27929938c4c9b3e2d075
font_02_sfnt_off00011a76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A76 10212 bytes
SHA-256: 738a07ac3417be64ad766827e45f56ff0df3e8a1ffbb8232e7f01106487a47d8