Malicious PDF — malware analysis report

Static analysis result for SHA-256 86f8f18cf7d3a4bb…

MALICIOUS

PDF

99.9 KB Created: 2021-08-14 06:47:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2a3a72f8b13340f9a0131a12b33c4095 SHA-1: 1f94814f9fc724aef0224346ddac011b552653aa SHA-256: 86f8f18cf7d3a4bb5d100a28408cedeb045313785b9a504cb095eaa2b2374417
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting domains. While no scripts were extracted, the structure and numerous external links suggest an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 6

  • 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.
  • 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://drive4smilesontario.com/clients/e/ed/ed023a0734c265ca673a92d1d81de675/File/66759585206.pdf In PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160d6fcdcd8cde---32800810826.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16087e6e62ee33---8987018959.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/7ea72fa38ec442bf2f00de3e30baac21/81828094241.pdfIn PDF document text
    • http://thucancakoihikari.com/luutru/files/49207987623.pdfIn PDF document text
    • http://shinex-auto.com/userfiles/file/69201347809.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d074517a3e---gipidenuzakegarur.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ae89a462c3c---bujelojubozinapobo.pdfIn PDF document text
    • https://wfca-czech.cz/temp/userfiles/files/66857646695.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1623273746---86139178.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/0c9c99b9e901b5d3424911fbc12edcf2/75482355860.pdfIn PDF document text
    • https://evenimentecastel.ro/wp-content/plugins/super-forms/uploads/php/files/flo1hv7sr3u3re1gsuo7p75cvg/rolijefefisogo.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160d7a9ef30d5e---demol.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a4512b9a4c9---21522417559.pdfIn PDF document text
    • https://tonycustomtailoring.com/nbloom/fckuploads/file/kofizirenebubopukan.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092705e48980---ferezumexolesudefij.pdfIn PDF document text
    • https://wavesmaroochydore.com/wp-content/plugins/super-forms/uploads/php/files/8jum361cbjh3ml72bnkoat6ff9/roxoxu.pdfIn PDF document text
    • http://kibbkw.com/uploads/files/xakuzilaliputefazotubiro.pdfIn PDF document text
    • https://batikatravels.com/userfiles/file/nawutelawesomopemobugu.pdfIn PDF document text
    • http://innospectrum.eu/hirlevel/file/raroxivubujolitivopobid.pdfIn PDF document text
    • http://xn--dlek-5qa.com/admin/UserFiles/file/xuxij.pdfIn PDF document text
    • https://melz-feu.ru/upload/rogujigagiwetiku.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=why+is+transpulmonary+pressure+always+positivePDF 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_off00012565.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12565 10876 bytes
SHA-256: 0d1ba61d81e2638b1d92e0615e7f2bb85dde017e09a2ebd262cba069c927d101
font_01_sfnt_off00013e62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E62 16376 bytes
SHA-256: 772d65a111f9110e2835fa6ea9250e4800a0f4185309591291d713ffc77edc55
font_02_sfnt_off000168e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x168E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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