Malicious PDF — malware analysis report

Static analysis result for SHA-256 b647121a1a3b3748…

MALICIOUS

PDF

70.1 KB Created: 2021-09-29 04:57:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5b804b66688adae3125d84f8446b479d SHA-1: 7a4758ae8dc612d05bf8f52b0fc79b13b63ba3ce SHA-256: b647121a1a3b37488292dd30fda94af10eead5508172720ae00cdd850bbc8c06
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://doktor-okonski.pl/uploadimg/file/46375992388.pdf In PDF document text
    • http://swhwsolution.it/ckeditor-ckfinder-integration/uploads/files/72390746849.pdfIn PDF document text
    • http://wamer.org/userfiles/file/21881742096.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/a9b53cf818d550b07006303b838f4033/35886027507.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/16153c6b140629---74296130439.pdfIn PDF document text
    • http://galsabino.it/userfiles/files/bumabomufepatejakubiko.pdfIn PDF document text
    • https://cicasoftavukatwebsitesi.demowebsiteleri.com/upload/files/66589156550.pdfIn PDF document text
    • https://mediaskills.rs/files/97426966982.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/328faa8a7bce95e038dbf71eb363f250/55068030788.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/g7klq1t22k12bgkb50g122ad05/52062257041.pdfIn PDF document text
    • https://nonbodepsg.com/uploads/files/munug.pdfIn PDF document text
    • http://vit-physio.de/file/jopupudoronumufuwuwofepiv.pdfIn PDF document text
    • https://hotelgaric.com/upload/datoteke/pajurazalaxakavatafud.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/50ebb1162110ffb09c4dbe76cae3857d/50955916968.pdfIn PDF document text
    • http://lamgi.pl/ckfinder/userfiles/files/muwamebi.pdfIn PDF document text
    • http://ozhelalikram.de/resimler/files/sopuvadabojisazirisile.pdfIn PDF document text
    • https://djennebeads.com/nbloom/fckuploads/file/jiwokuranojidugoxudu.pdfIn PDF document text
    • https://chasehr.in/userfiles/file/fulutusipitinujupifavi.pdfIn PDF document text
    • http://entryexpress.online/chapter_images/files/38949834085.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613c37a3b4239---jizasakux.pdfIn PDF document text
    • http://weingut-suppan.at/files/gidirezulurezubutopudow.pdfIn PDF document text
    • https://www.mftelhas.com.br/adm/Editor/ckfinder/userfiles/files/81756943760.pdfIn PDF document text
    • http://sintjorisparochie.nl/userfiles/file/kimivaragu.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614d5ca13857d---wovuvuxelewo.pdfIn PDF document text
    • https://liftsystems.ro/LiftFiles/file/nasita.pdfIn PDF document text
    • http://stark-tools.ru/images/uploaded/60682091040.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=wps+2020+apkPDF 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_off0000b478.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB478 9880 bytes
SHA-256: 19b7087aa741fcbdc3bf4465a384ec2087ab01d0b343c3808f496cb36ee3f89c
font_01_sfnt_off0000ca6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA6E 15864 bytes
SHA-256: d2315410d91d13b8e45a396951b3537750e33d2536eadd1f5c437a1a6dcc4f6e
font_02_sfnt_off0000f2bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1