Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc04ab44f901c6a6…

MALICIOUS

PDF

83.2 KB Created: 2021-09-19 20:30:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 106203ab64e3b78809e285e9e89a838e SHA-1: 8b03f7da199b0367762c412c3f643283d44d349b SHA-256: bc04ab44f901c6a6cac7b3911ce6d64d63840eb9a864a0b1f0220a978378c1ab
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document exhibits characteristics of a phishing lure, impersonating cloud document services to trick users into clicking embedded links. Several heuristics indicate a link farm hosted on disposable or compromised domains, with ClamAV detecting it as a phishing trojan. The presence of numerous embedded URLs, many pointing to suspicious or unknown domains, further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

Heuristics 7

  • 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.
  • Cloud document impersonation lure medium SE_CLOUD_DOC_LURE
    Document impersonates a cloud file-sharing service such as SharePoint, OneDrive, Google Drive, Dropbox, Box, or Microsoft 365 and asks the user to open, verify, or access a shared document
  • 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://aylabawadi.ae/userfiles/file/xosupesogivurimajej.pdf In PDF document text
    • http://xn--49s538bo8ux8c.net/userfiles/file/91430696878.pdfIn PDF document text
    • http://samnakthodrahassob.com/userfiles/file/tiselumibemobaruvixe.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613008732deb1---18272564895.pdfIn PDF document text
    • http://www.binghan.my/userfiles/file/voxirumuzoxaganegedijig.pdfIn PDF document text
    • http://nguoigiupviec99.com/webroot/img/files/23271482337.pdfIn PDF document text
    • http://hotel-ambassador-nice.com/upload/files/javabefulemorosuvifasetit.pdfIn PDF document text
    • https://bank-kredit.at/ckfinder/userfiles/files/kudepabojop.pdfIn PDF document text
    • http://mamnonkitty.com/webroot/img/posts/files/bafol.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1614090ede7a35---vumizabodoxukidubavobuge.pdfIn PDF document text
    • http://contentworks.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161346e206a8bc---wewemumujuv.pdfIn PDF document text
    • http://www.hussco-steel.com/husscofiles/files/83807880690.pdfIn PDF document text
    • http://sluchatka-shop.cz/files/upload/files/fumugizukiwu.pdfIn PDF document text
    • https://thaiwoodengames.com/files/upload/files/24288794946.pdfIn PDF document text
    • http://syntra.pl/userfiles/file/22060774473.pdfIn PDF document text
    • http://elementsgogreen.com/userfiles/file/68883819920.pdfIn PDF document text
    • https://equinox-e.com/upload/UserFiles/file/97534492023.pdfIn PDF document text
    • http://generaltubi.com/container/ckfiles/files/60796880316.pdfIn PDF document text
    • http://kantipursecurity.com/userfiles/file/wonenilalosuxa.pdfIn PDF document text
    • http://kimyasaldubeller.com/upload/ckfinder/files/50032112036.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16132981d6a5c6---pafotenexilokosoku.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+screencast+my+phone+to+laptopPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d5b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5B8 17772 bytes
SHA-256: 22b74e6ca42421fe1bde22e0272db73305590e53c0e3a6a9294cfef43aa36236
font_01_sfnt_off0001044e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1044E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C65 10736 bytes
SHA-256: e4218f60e674b9b76e53956f6226b17f3184cffe0bfd2cc619db05fbf90d7d06
font_03_sfnt_off000134f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134F1 2192 bytes
SHA-256: cfb1580163e84f4efb6b278a67b6d9731dd035c0dfe3fc275b589aeb22e353f6

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