Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b96f575e282e26c…

MALICIOUS

PDF

77.1 KB Created: 2021-07-05 01:59:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: bb80a8ef9acf4f904a6baa7a685cd8e9 SHA-1: f6710cc3303e5e4ab2653bf0be64c1102ba3bcfa SHA-256: 9b96f575e282e26cf6b0e7d7cf5cffba5c4daa654ec2bb28b962b33d097deda6
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV detecting it as a phishing trojan. It contains numerous embedded URLs pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and unreadable, but the presence of external URI and link farm indicators strongly points to a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://philabc.ru/uplcv?utm_term=modern+production+operations+management+buffa+sarin+pdf+free+download PDF link annotation
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a4ff87ad81---86569642427.pdfIn PDF document text
    • https://hospvetcentral.pt/site/upload/file/68422869609.pdfIn PDF document text
    • http://modern-pro.ru/files/file/pakoseku.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/e0a49c925980bd82dd60fe8a7c9f226e/85698997615.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2e775280e6---guxipibumodira.pdfIn PDF document text
    • https://detector-billetes.com/Imagenes/file/11678969265.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/f7beb008980f027cba43b9b8f3710714/25306696929.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/2d2e0f7dddaed791cb66178180c7d7cc/21547093845.pdfIn PDF document text
    • http://otelm4b.ru/admin/ckfinder/userfiles/files/bidugejowamedifaxewojev.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c19cbcccc86---vonuzipafozuvav.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/160766f5d61626---folefuje.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607001b47bed9---paxojutejijas.pdfIn PDF document text
    • http://nacyc.jp/Upload/file/10278105179.pdfIn PDF document text
    • https://mcq-exambd.com/app/webroot/ckfinder/userfiles/files/rulubujuwawuloxezutoxopu.pdfIn PDF document text
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/718jk4v94io8om172d5qekc9s0/33350848791.pdfIn PDF document text
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/8c7f38bac0ff20261017dbe7b52d9d16/sesimi.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/ac23a467b83e1ca1da2914d834c10b2c/murimame.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160983e790b213---kilolixabotujuderi.pdfIn PDF document text
    • http://bettynblue.com/upload/fck_img/20210620/file/xurabomeruviwonel.pdfIn PDF document text
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/6sg8oa9msgg2obni76gh22mnmq/vawidulobelozapagenut.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_off0000c963.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC963 16520 bytes
SHA-256: 76f349933df61efcae7fcc709004b7c63e26b5f93dd77e114f11ae7a60b091c8
font_01_sfnt_off0000f487.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF487 11280 bytes
SHA-256: 060f4709fad59b6c521a885babb406f630f157b9a26a184558ac5d7ba8c559b7
font_02_sfnt_off00010ea4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EA4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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