Malicious PDF — malware analysis report

Static analysis result for SHA-256 cac2264a65bb2256…

MALICIOUS

PDF

72.5 KB Created: 2021-09-02 22:33:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: eb4994a2594593083f37dd9cc61ff8b2 SHA-1: 8e15742e9d9e088bd09b51a1317d7d7692779f4b SHA-256: cac2264a65bb22569a275fd7bb26d59bb412565a393a9f8dcdb52b434f8a96a3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to potentially compromised websites or link farms, suggesting a phishing or malware distribution scheme. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further supports this, indicating the document is designed to host or redirect to malicious content. No scripts were extracted, but the overall structure and URL patterns are consistent with a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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=hardware+troubleshooting+steps+pdf PDF link annotation
    • http://clinical-pain.com/pds/userfiles/files/zirariwijofot.pdfIn PDF document text
    • http://kovovyroba-nosniky.cz/UserFiles/File/geseje.pdfIn PDF document text
    • https://vv-alc.nl/uploads/files/xugapixufiw.pdfIn PDF document text
    • http://www.mostenpo.jp/userfiles/files/berebivegefas.pdfIn PDF document text
    • http://atenngo.com/admin/sites/site/documents/26122226491.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/46908a8a8509d4af6bb651a2cfc77c37/zisebexoxokifeg.pdfIn PDF document text
    • http://htwy.com/upload/file/16684686214.pdfIn PDF document text
    • https://balajihighfields.in/userfiles/file/34636278706.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/4qc1hp6802j2d9ostbt5lkkvlf/mutidedawa.pdfIn PDF document text
    • http://woodsfamilypride.org/clients/2/2c/2c83419adcf4927d74d3defe18342386/File/norefolajebewomivexu.pdfIn PDF document text
    • http://health-bridge.in/upload/file/55516200118.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/a0441e5df6b7bcd41ceb7dac448b25b2/lukojijojisukada.pdfIn PDF document text
    • https://whiteelephant.co.in/wp-content/plugins/super-forms/uploads/php/files/0eb2d72aa5b809a361061793235c36c0/45185301368.pdfIn PDF document text
    • http://xahscw.com/userfiles/file/78298072256.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/160791e2863754---zajolap.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074c9b5db43a---73022751963.pdfIn PDF document text
    • https://tenekedjieva.com/uploads/file/40362040804.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fdde2c9ebd7---bupem.pdfIn PDF document text
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bfae2a6b52d---gepuwagusisemobus.pdfIn PDF document text
    • http://kadh.kr/bobod/upload/file/gapifizat.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/38825b3e113412b127d8050cdae4a20e/73750106445.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_off0000bba7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBA7 11096 bytes
SHA-256: 13cf01a2757a7135a50071b6bbeff2fa1203b2bf70197b5c81eaf91ee95f0b0b
font_01_sfnt_off0000d4fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4FE 15508 bytes
SHA-256: 228e70ac1ac1fcf18fafc82d01ca8c903a8a0822919af73a3e9ecff58dcd982c
font_02_sfnt_off0000fcd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCD6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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