Malicious PDF — malware analysis report

Static analysis result for SHA-256 7175bf71476ee200…

MALICIOUS

PDF

83.9 KB Created: 2021-09-04 05:57:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 9bd425462ddced32037063a7c3acbae5 SHA-1: 1c515cdc709e2192bb7a3d812a310bdcfa449b6a SHA-256: 7175bf71476ee200526192753efd6ae80744f150fc74dedaad699b9eaf494ef4
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms, indicating a link farm designed to lead users to malicious content. The ClamAV detection and ML classifier strongly suggest this PDF is malicious, likely serving as a phishing lure or a distribution point for further malware. No scripts were extracted, but the structure and URL patterns are consistent with phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://medvor.ru/uplcv?utm_term=biblia+catolica+pdf+in+romana PDF link annotation
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/095d17b97e341eb4d24e64779c3c6a31/48317723260.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ef73ecd647---116592249.pdfIn PDF document text
    • http://japan-railpass.info/images/blog//file/89864228270.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/3l37g612dgtq7ev8k8ecqgs9uv/gepanapigujo.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/9180e530891c880416e34d537675d48f/90651836789.pdfIn PDF document text
    • http://abwingsmd.com/uploads/files/vujetiwovemoxukesisosirit.pdfIn PDF document text
    • http://deborahkay.com/ckfinder/userfiles/files/86619078984.pdfIn PDF document text
    • http://lexen.ca/userfiles/files/ludiporu.pdfIn PDF document text
    • https://readandenjoy.ae/userfiles/files/sigejovitigoraludit.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b92d1af03e6---20711791125.pdfIn PDF document text
    • http://microcement.ua/userfiles/file/32464358053.pdfIn PDF document text
    • http://cokhixnktientien.com/Images_upload/files/datikuwelave.pdfIn PDF document text
    • http://solee.cn/ckfinder/userfiles/files/zavobibudofifevuzuruwag.pdfIn PDF document text
    • http://shopsuathientu.com/uploads/userfiles/file/lewagewipujadi.pdfIn PDF document text
    • https://ctcitsupport.com/media/files/fakafuduxug.pdfIn PDF document text
    • http://irinka.org/ckfinder/userfiles/files/58496140494.pdfIn PDF document text
    • http://tai-yang.tw/taiyang/upload/file/pazafozidezusubawinagibub.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/160987cf154465---60777868636.pdfIn PDF document text
    • https://archielectronics.com/userfiles/files/96206774976.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160759341ce5c5---6102456122.pdfIn PDF document text
    • https://eitmedu.in/ckfinder/userfiles/files/52769514038.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/93288358025.pdfIn PDF document text
    • http://infinity8talents.com/userfiles/file/66602200078.pdfIn PDF document text
    • http://rkmaster.ru/uploads/files/kujuxez.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/91089140113.pdfIn PDF document text
    • http://hudsonohiohighschoolclassof1980.net/clients/7/7d/7d4b1ad73701457990394555a34ab01f/File/87203245811.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_off0000db80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB80 10676 bytes
SHA-256: 4cb45936d653a89590aa9d254817dbbc358a2c6a38f64c9740fd203c87d2dbe3
font_01_sfnt_off0000f3b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010bcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BCB 21276 bytes
SHA-256: fbe60637baf30f142ed78a274a07ad30f22224e00b9f478c63e86ba30869079c

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