Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0aae4636029f23b…

MALICIOUS

PDF

75.3 KB Created: 2021-09-30 15:04:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: fc0c08163be28cfc3be5e4a41490124f SHA-1: 0e9f2b00c92e231e7b3f2299bad7dc93b9277f90 SHA-256: f0aae4636029f23b51188ec21acd84f8a3be415890da021122bcf38db8117f5f
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, and the document body was unreadable, so the primary attack vector appears to be the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

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 http://4998horo.gmmwireless.com/contents/files/9373732838.pdf In PDF document text
    • http://imi.vc/upload/files/zebolib.pdfIn PDF document text
    • https://greenlandpark.com/uploads/files/jifinulinebat.pdfIn PDF document text
    • http://phutungototuanphat.com/img-tvdl/files/nomelusalimurugajatibozo.pdfIn PDF document text
    • http://fujiya-la.com/uploads/files/67153539187.pdfIn PDF document text
    • http://mecateengenharia.com.br/ckfinder/userfiles/files/23025480630.pdfIn PDF document text
    • http://fuerst-architects.com/uploads/file/wemiwutagukipudavogosan.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/3ac30394fd0fd3174efcbc934af4861a/kexoxo.pdfIn PDF document text
    • http://allasclub.com/campannas/file/kolijiwunub.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/movijitawokovejiguwusemu.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/1614616158a626---93717775840.pdfIn PDF document text
    • https://akproauto.net/nbloom/fckuploads/file/widasepuvo.pdfIn PDF document text
    • http://mirutte.com/newsfiles/files/4282017112.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/1b85e28e06dd34eb5bc2344d90d1cc22/30081379926.pdfIn PDF document text
    • https://ladangmimpi.com/contents/files/zarodomegiwimejub.pdfIn PDF document text
    • http://luxlustry.ru/img/upload/19899237415.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132b54a28f43---34735346882.pdfIn PDF document text
    • http://mpwlawpa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zazibelenonidamixoxupife.pdfIn PDF document text
    • http://hz-karavany.cz/ckfinder/userfiles/files/75010609890.pdfIn PDF document text
    • http://haisushitogo.com/uploads/files/85988074202.pdfIn PDF document text
    • https://nonbodepsg.com/uploads/files/tufasuzadi.pdfIn PDF document text
    • http://hgbs.de/userfiles/file/bilebe.pdfIn PDF document text
    • https://mujeresenmovimientoplus.com/userfiles/file/fojoporatuboguvujevunik.pdfIn PDF document text
    • https://dyaa.club/uploads/file/75189733843.pdfIn PDF document text
    • http://www.gpkoaee.ru/ckfinder/userfiles/files/patoroluwepaf.pdfIn PDF document text
    • https://lidiyageorgieva.com/ckfinder/userfiles/files/zarujoleb.pdfIn PDF document text
    • http://www.memoriahistoricamalaga.org/ckfinder/userfiles/files/dajajosowazusefaxiwiri.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=el+hombre+que+rie+victor+hugo+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_off0000bbd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBD7 19696 bytes
SHA-256: ff116dd7c5199ab11d298a9ff7f44f7fb15ad534b4bd7c7ab316c4fd74847567
font_01_sfnt_off0000ee37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE37 11068 bytes
SHA-256: b72e7ac710f546e78b7f82b54ec5059f4afb6e2d1b49dcec507632e6a0a2c43e
font_02_sfnt_off00010729.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10729 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1