Malicious PDF — malware analysis report

Static analysis result for SHA-256 54731d1c744827f7…

MALICIOUS

PDF

93.4 KB Created: 2021-08-06 18:09:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: dff200ee31f520be39d783894774d200 SHA-1: 8ba23a65f0ceb36a7a7c61de4acb4525f5f16777 SHA-256: 54731d1c744827f7258493320df673e50af443ca7ab716f27706c23707df1d77
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of a 'password-protected archive handoff' heuristic suggests the document is designed to trick users into downloading and decrypting a payload, likely to bypass gateway security. While no scripts were explicitly extracted, the PDF structure and numerous embedded URLs, some pointing to compromised CMS uploads, support a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://stevis.cz/files/file/73644577918.pdf In PDF document text
    • http://hanarotalk.com/userfiles/file///nekejawifaxes.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/2dej45fd06tsjrecpf7j50lqv0/66806695782.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/6a834385dcfd0e3688beaf3e5f9efd96/36163608395.pdfIn PDF document text
    • http://dailyxedayhang.com/userfiles/files/zigezidexezujuwesiz.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608666fcd3de1---45461337144.pdfIn PDF document text
    • https://www.anandtirth.com/wp-content/plugins/super-forms/uploads/php/files/enmhbam2gbd5k5jg3479da36i4/36228169635.pdfIn PDF document text
    • http://techbis.pl/files/file/bobukitogame.pdfIn PDF document text
    • http://inwallendorf.de/userfiles/file/tujukenosujufirik.pdfIn PDF document text
    • https://tractorpulling-emmeloord.nl/upload/file/wepufewivisosoguwiwuki.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/ofe22c39kfbs82v58g9029lua5/85596821258.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///xekizajozigubuxogelakeso.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161000d5e7655c---dosuzalivipokaxofep.pdfIn PDF document text
    • http://h-st.nl/bestanden/files/jesixufezuvow.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a6eefcb74df---wivujexegezu.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608623cee7b87---10306747619.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/d3f544e882b39af97052e6772096f2a6/53162053552.pdfIn PDF document text
    • http://antonio-pelella.eu/userfiles/files/kefelo.pdfIn PDF document text
    • http://naplesredeals.com/userfiles/files/kokilalorenididarukofi.pdfIn PDF document text
    • https://yodishit.com/uploads/userfiles/file/gewimutanetozamavaderu.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/e52e32067dc5433a15894eff64ee4016/vebax.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072ae115e7fa---koxofagal.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=pokemon+red+randomizer+rom+hack+downloadPDF 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_off00010743.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10743 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011f5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F5A 10608 bytes
SHA-256: 3adaae351d76d2158e60f2226949d5d1d0ca38213a74d006d55ae31866695ec7
font_02_sfnt_off0001376b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1376B 17620 bytes
SHA-256: 51e066f9ea563ed45b184ff6630e38ac66261ead26235e0ae1918cfd9828e565

Open this report in the interactive analyzer, or submit your own file for analysis.