Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3ddeca09ce3d845…

MALICIOUS

PDF

70.4 KB Created: 2021-09-29 05:45:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b71768fb0451ef9d8e68d8d634dd90e6 SHA-1: cc6c018b7dbccf4a8ef5651086deb1fc971044cb SHA-256: f3ddeca09ce3d845232f8498dff5a54e93b2c3e3dfbb38e3ebe7c6b0279efb11
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to disposable hosting or compromised CMS upload directories, indicative of a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are consistent with a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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://raselapp.com/userfiles/file/gulikeran.pdf
    • http://moveworldtogether.com/datas/files/64418414186.pdf
    • https://immo-cjeanpaul.lu/userfiles/files/2770635680.pdf
    • http://fongyoskert.hu/userfiles/files/fikogunikowise.pdf
    • http://bptramptour.pl/files/file/jiwutipiwiwupumifitarebe.pdf
    • https://sukienmiennam.com/userupload/files/vederikugusafogom.pdf
    • http://sov.tranovice.org/webpagebuilder/ckfinder/userfiles/files/januxilufoginotavejejup.pdf
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/4en21i4d4j2bs52d418m3f7e13/mejezapopu.pdf
    • http://royalgoodviewresort.com/Uploads/file/jokulexe.pdf
    • https://toananhmedical.com/uploads/files/zapanabolefego.pdf
    • http://dr-onesrl.com/userfiles/files/32824646179.pdf
    • https://mmgrowersg.com/ckfinder/userfiles/files/powafonunuxufibigafu.pdf
    • http://grandviewgroupresort.com/upload/files/tugowifedimudujap.pdf
    • https://acrgroup.nl/userfiles/file/49801835909.pdf
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16143a7ee65d97---85524107049.pdf
    • http://kcemsp.org/upload/editor/file/59008948483.pdf
    • https://ginniglobal.com/uploads/file/vuvosatewafuwonurum.pdf
    • http://genarchi.com/data/temp/file/29337449393.pdf
    • http://partnercable.hu/files/fasumofinesibapobopojafij.pdf
    • http://ks-klinika.ru/ckfinder/userfiles/files/lobud.pdf
    • http://saktigroup.in/uploads/tabosoleziziwu.pdf
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/e78e95f8b6b071b392295f9c3efc115d/61196636645.pdf
    • http://baracenter.be/userfiles/file/xaxemizajemaropufotepe.pdf
    • https://synersys.fr/contenu/file/52807289851.pdf
    • https://ctapigroup3.com/contents/files/83435496754.pdf
    • https://pelicanfinancialnetwork.net/ckfinder/userfiles/files/65092662047.pdf
    • http://isleford.com/filespath/files/20210909181813.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=friday+night+funkin+original+apk
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b5ad.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xB5AD 16792 bytes
font_01_sfnt_off0000cdc4.bin
5dfdbf369d238f30e3adf02c94caaedb0ff97b15168440905bd6d5d02014a94a
pdf-font-stream PDF embedded font (sfnt) at offset 0xCDC4 10760 bytes
font_02_sfnt_off0000e626.bin
18e438216b25aff75a5943de3e1fa762581aae393d17157c6203529fbfd3176a
pdf-font-stream PDF embedded font (sfnt) at offset 0xE626 14896 bytes