Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d2338f8d2e4eccc…

MALICIOUS

PDF

78.2 KB Created: 2021-09-17 10:48:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 7ba4e0f9d4c37b36766cb96f5ead4cc8 SHA-1: ed9435cca3960dfee33e0e4f9003508d871b82f4 SHA-256: 4d2338f8d2e4ecccd5fabde13e8eef89d5572c2974182e631e9b7990043cb44c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of links, many pointing to disposable or compromised domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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 http://vititanon.com/user_img/files/tunubekixe.pdf In PDF document text
    • http://js-space.de/userfiles/file/xafor.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614093fb9a42c---78869672353.pdfIn PDF document text
    • http://csc0532.com/userfiles/file/20210905181803_aph05c.pdfIn PDF document text
    • http://medicare-darmstadt.de/bilder/UserImages/file/38840273640.pdfIn PDF document text
    • https://agencement-menuiserie-var.fr/stockages/files/kibadebaxi.pdfIn PDF document text
    • https://mancomunidadvaldizarbe.com/userfiles/files/lojedakurepuwalupivujim.pdfIn PDF document text
    • http://congtyvima.com/images/Download/8514257040.pdfIn PDF document text
    • http://thsport.dk/userfiles/file/mifurijinapomulunixoturo.pdfIn PDF document text
    • https://manorhair.com/uploads/files/202109110244537441.pdfIn PDF document text
    • http://nhactheducthammy.com/upload/files/mevitafekanulagaxak.pdfIn PDF document text
    • http://idealhca.com/admin/images/file/jaweloso.pdfIn PDF document text
    • http://gaudi.tw/upload/file/gezaguzuza.pdfIn PDF document text
    • http://frutapac.com/ckfinder/userfiles/files/bezejorel.pdfIn PDF document text
    • http://winhazel.com/indigo/ckfinder/userfiles/files/25234378089.pdfIn PDF document text
    • http://fabiocaronearchitetto.com/userfiles/files/nubabimajujuzimodel.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/2i2elumdslp3pmd33d87074v85/zovupume.pdfIn PDF document text
    • https://uslugiinzynierskie.eu/eurostyl/photos/file/relel.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613f9364a0995---49631630579.pdfIn PDF document text
    • http://thesciencenetwork.org/uploads/files/44132722875.pdfIn PDF document text
    • https://editora-arara-azul.com.br/site/admin/ckfinder/userfiles/files/doxerafemes.pdfIn PDF document text
    • http://jobsandhi.com/uploaded_files/userfiles/files/18383756514.pdfIn PDF document text
    • http://schule.havonix.com/ckfinder/userfiles/files/66390608880.pdfIn PDF document text
    • https://systematix.pl/userfiles/file/41806154462.pdfIn PDF document text
    • http://gelikonline.ru/content/Files/bisesulivogugezuna.pdfIn PDF document text
    • http://cn-biyoute.com/d/files/10023764731.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=how+to+use+phone+as+gamepad+for+pcPDF 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_off0000cbf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBF2 17344 bytes
SHA-256: 31f00b69a7acb5197d0cfd63acf6c2331655d3bb8378b6b5f22e6ca57a1698ef
font_01_sfnt_off0000f8f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8F9 11104 bytes
SHA-256: 1375a90803bf347e8e801537f0ea894820cfba085e7b467294e1c5ee064a7a2b
font_02_sfnt_off0001128a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1128A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1