Malicious PDF — malware analysis report

Static analysis result for SHA-256 0168da2ae628260f…

MALICIOUS

PDF

79.8 KB Created: 2021-10-20 20:28:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-07
MD5: ef9eaee6362104a29ee7dade85d1f337 SHA-1: 52f2ef9ff03c278e9be013205dd302c17556f1d5 SHA-256: 0168da2ae628260f8d87687bf2f7ecd2e91c09a5ec924cda66fc28dc359599a6
156 Risk Score

Malware Insights

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

The PDF file contains numerous links, many of which point to compromised WordPress upload directories, suggesting a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, and the document body was unreadable, but the heuristic firings clearly point to a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/tl622vve780dnvlminvqle8g18/kowan.pdf In PDF document text
    • http://www.investinwielkopolska.pl/application/lib/ckfinder/userfiles/files/notupedalesorutijusitif.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/161380465d5b88---gerobopoxeboxunidererer.pdfIn PDF document text
    • https://aurastaffing.es/upload/file/30619409654.pdfIn PDF document text
    • http://vtvxm.vn/userfiles/file/58157386418.pdfIn PDF document text
    • https://skvacations.com/userfiles/file/rafinadep.pdfIn PDF document text
    • https://maftplayer.net/calisma2/files/uploads/fevoxefojebaxuxike.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/2cf6181otlsjr10ndep9jc9704/79805982095.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/c1a4253b41082e3cadfcd6f66d0e3546/vipomovavumuxosanipujasu.pdfIn PDF document text
    • http://zuszdounky.cz/files/nevitewutitegolaj.pdfIn PDF document text
    • https://i-intelli.com/ckfinder/userfiles/files/10189284499.pdfIn PDF document text
    • http://lamorenj.com/userfiles/files/4505713448.pdfIn PDF document text
    • https://yar-net.ru/userfiles/file/9839275798.pdfIn PDF document text
    • http://leebyunghun.org/new/upload/board/files/23009701442.pdfIn PDF document text
    • http://apnschool.in/singhania/downloads/file/woduzakakizezeriselejob.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136f04a72ada---34130171941.pdfIn PDF document text
    • https://10fci.org/userfiles/file/54801613618.pdfIn PDF document text
    • http://nguoigiupviec99.com/webroot/img/files/gidujifelunadikusiru.pdfIn PDF document text
    • http://dvg.asia/ckfinder/uploadfiles/files/44536451392.pdfIn PDF document text
    • http://clarklawtexas.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/22455990717.pdfIn PDF document text
    • http://dryoucosmeceutical.com/userfiles/files/welujuzamifebulofiwu.pdfIn PDF document text
    • https://themalc.org/files/file/27516027222.pdfIn PDF document text
    • http://polletnv.be/uploads/files/70365247568.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/KGDyd8lM0uI/uplcv?utm_term=mad+max+fury+road+black+and+chrome+torrentPDF link annotation
    • 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_off0000cf34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF34 11024 bytes
SHA-256: ae81c85da05159272033493eadf81545ad9686439d32a3d82f62628346f7f4ca
font_01_sfnt_off0000e8a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8A8 19180 bytes
SHA-256: bdfe46cc628860c476172896b7df6e9ddf76e1a3ac520594a7a132251f950bbe
font_02_sfnt_off0001199e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1199E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1