Malicious PDF — malware analysis report

Static analysis result for SHA-256 03fc54c9c3c8af54…

MALICIOUS

PDF

101.5 KB Created: 2021-09-19 19:07:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 86c52d62956bf3c7c08ef4879226caa1 SHA-1: cf2fe2daff3f79ecd29221bd9682c178ba68f59d SHA-256: 03fc54c9c3c8af549335e5e6919961246b97b0af83ebdb3058023255b2003b88
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document that contains a link farm pointing to various websites, some of which appear to be compromised WordPress installations. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates that the document likely instructs the user to open a password-protected archive, a common tactic to bypass gateway scanning. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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
  • 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.
  • 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 https://ecoquimica.cl/dinamicos/uploads/file/93528178483.pdf In PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613e1adeefac8---27638368815.pdfIn PDF document text
    • http://7profi.net/userfiles/file/78946861789.pdfIn PDF document text
    • https://rosebankprimary.co.za/inc/ckfinder/userfiles/files/29170081729.pdfIn PDF document text
    • https://www.hasmow.com.au/application/third_party/ckfinder/userfiles/files/jejilotuduvonuxufovobe.pdfIn PDF document text
    • http://banglenhospital.com/UserFiles/File/zidukixobe.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613b3763c1297---kutuxadale.pdfIn PDF document text
    • http://keletunderground.hu/images/uploaded_pics/file/89504011188.pdfIn PDF document text
    • http://savvyais.com/userfiles/file/52690065656.pdfIn PDF document text
    • http://arsvet.ru/img/upload/14851442389.pdfIn PDF document text
    • http://aquatherm-graz.at/files/nutasetasetukikobekifa.pdfIn PDF document text
    • https://vroa.pl/chplusfiles/file/16409616717.pdfIn PDF document text
    • https://soudurelausiere.ca/upload/editor/file/semitewoxamefobu.pdfIn PDF document text
    • http://covina.crazyrockinsushi.com/uploads/files/88869716636.pdfIn PDF document text
    • https://raiporjai.com/piceditor/file/76263715724.pdfIn PDF document text
    • http://pomodorolennep.de/gfx/userfiles/files/20264344299.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/cbf6b1a89a9c3060e5dcde91a1f58c56/torazugedijim.pdfIn PDF document text
    • https://ntpuvoice.com/ckfinder/userfiles/files/dovakugedobedebi.pdfIn PDF document text
    • http://dolinakrzeptowa.pl/public/upload/ckfinder/userfiles/files/30291885012.pdfIn PDF document text
    • https://grandhotelbulgaria.com/userfiles/file/fonemijakotira.pdfIn PDF document text
    • http://ylpqzl.com/ckfinder/userfiles/files/fotuv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=come+salvare+i+messaggi+di+whatsapp+su+pcPDF 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_off00012501.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12501 18620 bytes
SHA-256: 1124a1715ddbf146becd9f0e42a044d97d0b753aeeb634e3b3e8e65ced93ed41
font_01_sfnt_off000155d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x155D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016deb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16DEB 11140 bytes
SHA-256: 4ba779d51aeaee5e0ca7dd5e4c7f98d26ec6d9630513a91091855cc46dd25c38

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