Malicious PDF — malware analysis report

Static analysis result for SHA-256 c54f51dd3174bfa3…

MALICIOUS

PDF

112.7 KB Created: 2021-06-28 06:54:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: f4a96f17583bb9ab2e4fa2f1bf3fd9ed SHA-1: 84a4669d5b0c8c9a54a326e5b83ad6be85009ec3 SHA-256: c54f51dd3174bfa306fb048e64447a28bc35d832044be4d15271ce53912cf2e5
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, indicating a link farm designed to distribute malicious content or phish users. ClamAV and ML classifiers confirm its malicious nature, specifically flagging it as a phishing trojan. The document body is unreadable, but the heuristics strongly suggest a malicious intent through its extensive use of external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9886

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/75131753104.pdf In PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d9760169a3---duluvexat.pdfIn PDF document text
    • http://branpc.in/ckfinder/userfiles/files/91997483362.pdfIn PDF document text
    • https://educationindiajournal.org/ckfinder/userfiles/files/98777958727.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607048f812cf9---xomudunavumidadizetizuk.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be26c73ea61---62745089058.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/03e6666743414516cae3c78dea008473/duputurawezubomonomamexaw.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8dcfe85adf---52592143536.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/6cfae9f6fae08641a49e1b555b1d2f8f/makopotifab.pdfIn PDF document text
    • http://qhs1978.com/clients/d/dd/dd8db5a278a7ad55a2ada34b8e38ebcc/File/16292104409.pdfIn PDF document text
    • https://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/3d196ad7599cf45c3cb33ee56f539c11/roxudowa.pdfIn PDF document text
    • http://mcutech.net/upload/2021/06/file/1623914357664502580.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607967ea16dda---gosajedizumuto.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160b06fdc4c90d---bexobativeletupa.pdfIn PDF document text
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/cfda15cbe9745eceb438dc0b0a9e0145/93243986347.pdfIn PDF document text
    • http://anhuizpyy.com/upload_fck/file/2021-5-18/20210518122545438420.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/gstg0fl6gf1mo9enkpjl7im7el/42366260981.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/160807d8a777f3---4209951768.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/160a0dd75076ad---48614029839.pdfIn PDF document text
    • http://prestopc.it/upload/file/63904005371.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/8446a12a6ae70e4018631d8decb1de61/wusujowuviwikux.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/2fe5eee69af94ba9c20ff9b687ba1fbc/gobiniwatepovikexuw.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160970928ea19d---delejopopanofi.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/llifrv700fg10a39q0d4388rps/13373714655.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c13759b8c92---6436829111.pdfIn PDF document text
    • https://aymsoft.us/aym_image/files/wonekuvuwudus.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=daily+stretches+for+beginnersPDF 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_off00015824.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15824 10872 bytes
SHA-256: 91de46baf453ede1595d58b2f38d0a0a20f28b8114f83e2e7735d16391ba090c
font_01_sfnt_off00017142.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17142 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00018954.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18954 17040 bytes
SHA-256: d877c39673d14ef8a57f91e2e72e186d10c6e5a501159560692d619a6ba11409