Malicious PDF — malware analysis report

Static analysis result for SHA-256 8923744d4d0bf7c1…

MALICIOUS

PDF

89.2 KB Created: 2021-07-01 13:25:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: fc2cbe02cf3851eff19cb89ce5310d8a SHA-1: 564dc39f583cb4f8de2dc04b8e372119b514fa5a SHA-256: 8923744d4d0bf7c1a2202668a10f3160a27385ab9991abbd3bfb5504a53d4397
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URLs, many pointing to compromised WordPress sites, suggesting a link farm or phishing lure. The PDF structure and embedded content are consistent with techniques used to redirect users to malicious sites, potentially for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 https://crysiq.ru/uplcv?utm_term=0+degrees+to+radians PDF link annotation
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/wagaxowivugunebusigovo.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba83d4c7e96---81266410100.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608c9c9e2eab5---luwofalonikivajudebebigim.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/fdaac4e11b044003fb4814d81861f42e/92333932837.pdfIn PDF document text
    • https://nutstudio.it/userfiles/file/tusizarewiluridaput.pdfIn PDF document text
    • http://fullcolorspandoeken.nl/userfiles/file/83970321487.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/2dd11c79faa78151160d4f025235b94a/60831890352.pdfIn PDF document text
    • http://gopherandsquirrelcontrol.com/admin/images/file/pipewibetera.pdfIn PDF document text
    • https://islandsvefir.is/wp-content/plugins/super-forms/uploads/php/files/noap8l1vbmt39s48jb7d34lan5/23030886853.pdfIn PDF document text
    • http://wojno-stal.pl/pliki/file/rulubevuzevofebetipula.pdfIn PDF document text
    • https://bahia-group.com/ckfinder/userfiles/files/famoxokemotefexemutat.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/kv5nib1nrmbbo2dbuph3flv8e6/25654288178.pdfIn PDF document text
    • http://markasib.ru/ckfinder/userfiles/files/vonojo.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/020ec9886b66f15e652e7affd175671e/tekesuwawibi.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c8d8bca52af---rotojesekarokujifow.pdfIn PDF document text
    • http://sirmamedia.com/ckfinder/userfiles/files/pusaroxamekebirugujiz.pdfIn PDF document text
    • http://mchs67.com/clients/6/60/601da637195afcc8544498be66ee72b0/File/72135768315.pdfIn PDF document text
    • http://gleneaglehoa.org/images/file/sixamek.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a7540a85c48---85055510293.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/posemof.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/ijamivilikavemewunopelu.pdfIn PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/8c91sfa233eilvju0essru45kv/dimifilemibena.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c2b8b2dbc7d---39481448479.pdfIn PDF document text
    • http://tubietelbar.hu/uploadfile/3174690638.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160945b03ac7bd---xerezozazenuvemosamomid.pdfIn PDF document text
    • 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_off0000fb94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB94 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000113ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113AB 10400 bytes
SHA-256: 6ac1e85858811eb08cd2e869710c8d347bfedff04f1075553697e30cb5297b0b
font_02_sfnt_off00012b13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B13 17228 bytes
SHA-256: 194ca3e21f7305021667cb6ec0538873eea4603117913b67d7073f8dc32b3812

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