Malicious PDF — malware analysis report

Static analysis result for SHA-256 952c3acef321674a…

MALICIOUS

PDF

83.2 KB Created: 2021-09-20 03:53:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a4b5b78c18ef8d262591e4a1b1a5031a SHA-1: f261468145dddd5d050095d8b8baaa6f14c88344 SHA-256: 952c3acef321674a453b22997dfa686c7354b06b55d74771f3017a25b0cbff0e
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating it likely exploits a vulnerability or contains malicious content. The numerous embedded URLs and link farm heuristics suggest the primary purpose is to redirect users to external, potentially compromised, websites for phishing or malware delivery. No scripts were extracted, limiting the analysis of direct execution vectors.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9931

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://huntic.ru/uplcv?utm_term=super+smash+bros+brawl+para+android PDF link annotation
    • http://kozszemle.hu/uploads/files/wojazekelusego.pdfIn PDF document text
    • http://julianina.de/upload/file/91153558312.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16134cd9d8d7c6---92574476654.pdfIn PDF document text
    • http://hcbarrett.com/user_area/file/fegudonawixovupugodapapaw.pdfIn PDF document text
    • http://electriccityusa.com/images/fck_uploads/file/xujixisozu.pdfIn PDF document text
    • http://studiosiriosrl.it/userfiles/files/56643113461.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c0b38c188c---rewosupuluru.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613383b229f3d---lerasoxigejopupelopuzipow.pdfIn PDF document text
    • http://aotem.com/data/home/qxu1780220113/htdocs/uploadfile/files/fumuzo.pdfIn PDF document text
    • http://krukewittfarms.com/userfiles/file/47968431579.pdfIn PDF document text
    • https://hotelpancharatna.com/assets/userfiles/files/romokipekagakomulixejiw.pdfIn PDF document text
    • http://behtarinekhodetbash.com/files/files/neduxefavufevubuzo.pdfIn PDF document text
    • https://lostfoundglobal.com/userfiles/file/soxegonesozof.pdfIn PDF document text
    • http://safaraval.com/basefile/safaravalcom/files/52146876360.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147cd2e5de3d---daboxeken.pdfIn PDF document text
    • http://parentini.it/userfiles/files/88631713711.pdfIn PDF document text
    • https://kingcom.edesign.fr/gr33/web/uploads/assets/file/69183001912.pdfIn PDF document text
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/3f07618b43efd02e9b4463e23fd13972/vodekosadigebuxamixilusag.pdfIn PDF document text
    • http://jedzenie365.pl/ckfinder/userfiles/files/94898133814.pdfIn PDF document text
    • http://aucoindeshalles.com/menu/file/26446161688.pdfIn PDF document text
    • http://www.dialog-seversk.ru/jsplugins/ckfinder/userfiles/files/48650998415.pdfIn PDF document text
    • https://hkpefa.org/editor_upload/file/zeregizixapikeb.pdfIn PDF document text
    • https://deltarents.com/upload/ckfinder/files/zurodizatavipidaziseji.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c654.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC654 10960 bytes
SHA-256: 3c4965ca7acd35f2aec4629059ee1748c1e37eaa970fd1ac371bb904116c4e83
font_01_sfnt_off0000df51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF51 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f762.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF762 16140 bytes
SHA-256: 00b1f632e8afe72716c8bcdb76b7901b56c060d1dc0f96f3f5c1b8373b85735b
font_03_sfnt_off00010cda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CDA 19380 bytes
SHA-256: 2c48ebbe9ba5c45e559de9c15dab5b3436993748da48e20b8cc3f1abd29f515e

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