Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcca7866df0dbb5d…

MALICIOUS

PDF

86.0 KB Created: 2021-09-01 06:57:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2296bd7e62a563faa83b4005eb291cb5 SHA-1: 90943f34c0045fdef440c823dd7c09b52dc37c19 SHA-256: fcca7866df0dbb5d1c0311d616a1ecdb3c0b1dcd379bacadd5a1611f57778abe
196 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics and a machine learning classifier, including ClamAV detection as Pdf.Phishing.Trojan. The file contains numerous links to external resources, many of which point to compromised WordPress sites and other potentially untrusted domains, suggesting an attempt to redirect the user to a malicious payload or phishing site. The presence of embedded URLs and link farms indicates a likely intent to facilitate the download and execution of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://mnlex.it/file/gutenarabupivigavumixade.pdf In PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8198363086---33309567898.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/cc269f9d5e36ee14274bfd1f304cbbcd/fuwejepafow.pdfIn PDF document text
    • https://rebel-guitars.com/wp-content/plugins/super-forms/uploads/php/files/59fdcc3e046ac13560d3fe0e4766ae77/morunakot.pdfIn PDF document text
    • http://cuatro-pr.org/sites/default/files/file/47605907315.pdfIn PDF document text
    • https://willmarareachamber.com/ckfinder/userfiles/files/xowusolusakusisix.pdfIn PDF document text
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/d2a2856941a136ed6d41d63df071cca4/gasagedipomurajuvinoz.pdfIn PDF document text
    • http://naoshima-tours.com/images/blog/file/nujafur.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/ffcb54449e2be6921aee311c1bfabe13/20936844426.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086f699c739f---54254904235.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb2151966bc---68527821031.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdab13ef9cc---parugexoluwisatoret.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160f4c600e0d8e---wukutusipuwafate.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/juxuvi.pdfIn PDF document text
    • https://villadorottya.hu/uploads/frontend/files/tepemimububezoxizitupi.pdfIn PDF document text
    • http://cooper1972.com/clients/b/b4/b451ebb09e7e0345645526f893d9a49e/File/sibirofexusaba.pdfIn PDF document text
    • http://xn----itbbfrdrdbd4bgy6gi.xn--p1ai/webroot/files/files/zuwejolazutuwalorupozal.pdfIn PDF document text
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1928540f98e59754b884740e6514fb8c/88283588042.pdfIn PDF document text
    • http://developmentassociationofnagaland.org/nbloom/fckuploads/file/47239170090.pdfIn PDF document text
    • http://takeacode.org/user/d41d8cd98f00b204e9800998ecf8427e/file/vugikolabuxabaz.pdfIn PDF document text
    • http://liburnia.pl/userfiles/file/87443134785.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609a0839034c4---23190632147.pdfIn PDF document text
    • https://castel.ro/userfiles/file/deserezelokedafiwa.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/8dd352686da4b76566b00e9e70e37b12/zatozufazibalajegenu.pdfIn PDF document text
    • https://energooptima.hu/upload/File/56093078395.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=anchorage+to+skagwayPDF 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_off0000e9a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000101bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101BC 10644 bytes
SHA-256: 21f2982194d8b7c3ab2ba5d7c74da8422d289d80ec5459f4616f7078ba5847d3
font_02_sfnt_off00011a39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A39 18332 bytes
SHA-256: f22235990277715b5e00acec9ac293893c9aa1cdd7edbd292759b589ab859abb

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