Malicious PDF — malware analysis report

Static analysis result for SHA-256 2873c0aa9ab07abe…

MALICIOUS

PDF

88.4 KB Created: 2021-07-24 19:44:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ee40fabd4bd52bac9f67874e43d36b95 SHA-1: ecf93c4229ef2321df6f50884939886795fbe29b SHA-256: 2873c0aa9ab07abee2f52e3fa0ee2e0b3eef7946db35cf21890eb4eef2586d86
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating a high probability of maliciousness. The 'SE_CALLBACK_LURE' heuristic strongly suggests the document is designed to trick the user into calling a phone number, consistent with callback phishing or tech support scams. The presence of numerous links to potentially compromised CMS upload directories and disposable hosting further supports a malicious intent, likely to host or redirect to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://peeweeslearningcenter.org/clients/5/54/545fcf94abc6bccf175f3035c740e6d3/File/99467584655.pdf In PDF document text
    • http://parbatsamajjapan.com/img/files/files/34398010280.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160d8c80219f9c---14340136006.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/a6d39abd7d966bb169dd89c03019d9bb/penanuvamivowa.pdfIn PDF document text
    • http://webinaris.biz/ckfinder/userfiles/publics/files/wubakaxilofutem.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16078a97d6927f---59207916697.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f17e63370a---85657254985.pdfIn PDF document text
    • http://atonoserver.com/userfiles/file/bojifuvifekurubi.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e1ed963cf56---mogebizir.pdfIn PDF document text
    • https://faceless.me/userfiles/files/41544352929.pdfIn PDF document text
    • http://mextro.de/upload/files/jusopedin.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/njiulqhc1apsuofqcccmpk7s4m/45860306394.pdfIn PDF document text
    • http://fujiya-la.com/uploads/files/vukatorusiminuvewugosebi.pdfIn PDF document text
    • http://changrung.com/ckfinder/userfiles/files/94543700296.pdfIn PDF document text
    • http://petra-dario.info/upload/datoteke/58086356530.pdfIn PDF document text
    • http://asorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sidigozepas.pdfIn PDF document text
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/971da7cc46026b3125db2b90721464df/jivilotelo.pdfIn PDF document text
    • http://accronline.com/userfiles/file/zexuxatira.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076d252f3d3b---fafegegurikige.pdfIn PDF document text
    • http://uci.ir/userfiles/file/doriwamedosafezemopefozaj.pdfIn PDF document text
    • http://ivepe-elearning.gr/assets/UserFiles/mainHome/file/29942449889.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/naxabafebezap.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/72937f564d58f0b9373bb1120225990d/ziweloxo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=westjet+carry+on+baggage+requirementsPDF 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_off0000f3bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3BD 17380 bytes
SHA-256: c1a3f8cba5f8a0160c6a15478b104be5cf54f9d414608eaf4e55735c77655ebf
font_01_sfnt_off000121a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121A9 11148 bytes
SHA-256: b0373c3d5752098cd09ca4e6a1473b5d3097b944837315cc5e77b6fe1957e4a3
font_02_sfnt_off00013b77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B77 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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