Malicious PDF — malware analysis report

Static analysis result for SHA-256 5676b5918fec3a05…

MALICIOUS

PDF

94.2 KB Created: 2021-08-17 17:06:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: cb774b3af254306a9672cb88b0d603fc SHA-1: 8c2fbc3d640d51b4fa0cf684462fb0aafa067910 SHA-256: 5676b5918fec3a052d8e377779f69504e021f25195b4418dafdee0ededbfafe2
96 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress upload directories or are hosted on disposable domains, indicating a link farm designed to redirect users. The ML classifier strongly identified this PDF as malicious, suggesting it's part of a phishing or malware distribution scheme. The presence of multiple links to potentially compromised CMS uploads suggests an attempt to host malicious content or redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 5

  • 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://profipreklady.cz/www/ckfinder/userfiles/files/jifafuk.pdf In PDF document text
    • http://hanasushipickup.com/uploads/files/sopazezinudu.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160b766f2bc485---85708031170.pdfIn PDF document text
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/e7483f83ed8d265cbb96f64c263b2c9f/40529123846.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/2bed1929229e2927043680e72a1a87ac/66443021554.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16097128ebf6fe---1837707736.pdfIn PDF document text
    • http://likebarcode.com/image/files/20210706_033511.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/dc3a14eeae348afbc4c4086a3daab3e4/11416878648.pdfIn PDF document text
    • http://jjburgerut.com/uploads/files/bisitizivopima.pdfIn PDF document text
    • http://doudou.tw/userfiles/files/rexigumonikokisoxisu.pdfIn PDF document text
    • http://arunimaflavours.com/userfiles/file/53830858543.pdfIn PDF document text
    • https://barcelonamedicalcenter.com/files/galeria/files/34285787157.pdfIn PDF document text
    • https://beauti-full.ru/uploads/files/99123913536.pdfIn PDF document text
    • https://myupfield.link/wp-content/plugins/super-forms/uploads/php/files/vvn55butp0aq9qps6og3ne0hgc/71858576118.pdfIn PDF document text
    • http://totoquynhhuong.com/upload/files/47439497259.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160ce7798cce10---15772052427.pdfIn PDF document text
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bfb7632316---rejokozozazevoxaxuteli.pdfIn PDF document text
    • https://acryl-bg.com/userfiles/file/rudekap.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092a7b61d205---gixefapidunowolabosuti.pdfIn PDF document text
    • https://etimes.mn/uploads/files/saranilejukefusipam.pdfIn PDF document text
    • http://stpatricksreunion.org/clients/84553/File/65532320874.pdfIn PDF document text
    • http://dragoniresorts.com/userfiles/84807308149.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=how+do+i+pair+my+xfinity+voice+remote+with+my+tvPDF 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_off00010a1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A1D 17456 bytes
SHA-256: e276b7d3de3c19b42e619e20e71111e318564fa21acc54fcbb06ae78e5e8fea9
font_01_sfnt_off0001381a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1381A 11032 bytes
SHA-256: d0e123ea7d0752fc76a72e3d594342da15a92ad884913d0cbdef7d1efb62ef77
font_02_sfnt_off000151a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x151A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1