Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ed58c7f404adba0…

MALICIOUS

PDF

98.7 KB Created: 2021-07-19 13:43:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: b99b3bf6d2667b79415d71e80fdaee84 SHA-1: 1b90018f4acdf3625f48acdb04a001af3b93f3bb SHA-256: 2ed58c7f404adba079f3ee3aedc0f742164616d0d5eb3dc95b2ebf6d18c9179f
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm hosted on disposable domains and compromised CMS uploads, suggesting a phishing or malware distribution scheme. The embedded URLs point to various PDF files hosted on these potentially untrusted domains, reinforcing the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9800

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://balogmihaly.hu/UserFiles/file/32435795120.pdf In PDF document text
    • http://cheapmarkt.com/userfiles/file/dogasefilo.pdfIn PDF document text
    • https://rcot.org/userfiles/file/xunewawoperenosiz.pdfIn PDF document text
    • http://cphs1970.net/clients/877309/File/70675141114.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1295ba453---40412803901.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16091a27ea4157---37476796319.pdfIn PDF document text
    • http://coming-c.com/userfiles/file/debanajitivos.pdfIn PDF document text
    • http://samtekelektrik.com/files/26169712348.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/160347071487.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074285f1e5bd---kemukinux.pdfIn PDF document text
    • http://kjphotocon.org/data/userfiles/files/81362809854.pdfIn PDF document text
    • https://www.ndgai.com/wp-content/plugins/super-forms/uploads/php/files/rtf7imnlnegqtru3suekl8884k/rafinesilukegasira.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/160f40b635938d---89648144062.pdfIn PDF document text
    • http://menafundinfo.com/userfiles/file/89800776489.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/b1e6aa10e43cb076dec257551827d763/tebizemiziwegom.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/upagtafbdbhl6nhulk49jvovl3/56786300163.pdfIn PDF document text
    • http://nsdadventist.org/FCKData/file/nikajufaxagor.pdfIn PDF document text
    • https://xn----7sbbjg7ctfs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/139bca5ea0212f02a269687c29ddcab6/9702052573.pdfIn PDF document text
    • http://pillshop.ru/uimg/files/31874943010.pdfIn PDF document text
    • http://assistance.uz/images/shared/file/34279300270.pdfIn PDF document text
    • http://twfindia.in/userfiles/files/kapumolake.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ec4dd618635---84375517534.pdfIn PDF document text
    • http://slp61.com/clients/e/e2/e296dcecfd7d10ffef0cc83fef253c72/File/33285253220.pdfIn PDF document text
    • http://tomaszfilipczak.pl/userfiles/file/29732464239.pdfIn PDF document text
    • http://charivne.info/images/file/10318506386.pdfIn PDF document text
    • http://prestopc.it/upload/file/20701355784.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=new+dictionary+of+american+slangPDF 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_off00011bda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BDA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000133f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133F1 10996 bytes
SHA-256: 298b483a4c4cceb5722310149eafe5c6766611d2a7e1e159f267e974146daca7
font_02_sfnt_off00014d59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D59 18340 bytes
SHA-256: 158a069d0062506c4248861b0a0697933c00495bad35e220e896aeefaa16ea52

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