Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb23c10a7bae1bf4…

MALICIOUS

PDF

88.0 KB Created: 2021-06-16 10:58:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 69432a3688e27e709f978ddecd88aaf1 SHA-1: 906fae5dedde166a117ba6d908acfe49027c1e9d SHA-256: cb23c10a7bae1bf4107bec7403290dfe40f1e359d185afc96338c74d1addd2fe
164 Risk Score

Malware Insights

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

The PDF contains multiple links to external websites, many hosted on compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of a 'download button' heuristic and ClamAV detection as 'Pdf.Phishing.Trojan' further supports a phishing or malware distribution intent. No scripts were extracted, but the overall structure and external links indicate a malicious workflow.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://medvor.ru/uplcv?utm_term=instagram+free+views+apk PDF link annotation
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/16081bfe222a5f---sotomirukilomuke.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609daf2c8de34---96432642834.pdfIn PDF document text
    • http://humanlitech.com/files/files/36777416406.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e0c2f326c8---lorexufopukamijogiv.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/1kf06sjcrd92fd9ndgphkqna21/48461166658.pdfIn PDF document text
    • http://dreamcatcherltd.com/userfiles/file/78533969731.pdfIn PDF document text
    • https://nestaerospace.com/uploads/file/79821028924.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/1mqt8074bhuund8psd5f5tagv9/1476282435.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/7d99ac36ccd031e4ec8260938cc14047/zorobogulujenuno.pdfIn PDF document text
    • http://okuninka-biale.pl/userfiles/file/kesakozegezuruwobiji.pdfIn PDF document text
    • http://boekenwinkelindex.nl/images/uploads/45569405778.pdfIn PDF document text
    • https://ottenburger.com/userfiles/file/nozoposo.pdfIn PDF document text
    • https://rsun.pro/admin/ckfinder/userfiles/files/kapopiroputezuduku.pdfIn PDF document text
    • http://braciszewska-klimek.pl/fck_files/file/4754417766.pdfIn PDF document text
    • http://leguido.net/files/438294211.pdfIn PDF document text
    • https://babamore.com/upload/ckfinder_temp/files/20210616094148.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn 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_off0000ef5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF5D 3776 bytes
SHA-256: 09732884cd5d1538c0a4def2f65cfbee4da9e80e5f0e9a127d8c231e808edbd8
font_01_sfnt_off0000fcbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCBD 5344 bytes
SHA-256: ea9ade72777dd3ccdddf81a06b37f74cc6b5dc502ba059ac1783d123a5f494df
font_02_sfnt_off00010ef4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EF4 15992 bytes
SHA-256: c5951a9205d16f7f130cfa5b55fd1f69a5f06e57062cdc5bfaa9df5f0e0fe1b8
font_03_sfnt_off00013d41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D41 16156 bytes
SHA-256: 45c3427915370a5f1224cdf059ba1074a5f0c22c4c9dccd53f1b2baf105af79e

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