Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a300dead7069884…

MALICIOUS

PDF

84.2 KB Created: 2021-09-18 18:26:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d6ccf9055cd4322234440960967e221a SHA-1: d7fa21d36ed983147ea267a8d098e938d16d393a SHA-256: 5a300dead706988435207c8f64a9b9aaf406b2e090782ffa299fcfd7aebc90ca
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users. The ML classifier strongly flagged this PDF as malicious, supporting the assessment that it is used for malicious redirection. No scripts were extracted, and the document body was unreadable, limiting further analysis of specific payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://irlanc.ru/uplcv?utm_term=word+mole+apk PDF link annotation
    • http://adice-area.com/pictures/files/7552399106.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/fojekugowa.pdfIn PDF document text
    • http://fourfoods.com/images/files/venexopiv.pdfIn PDF document text
    • https://birsamundapark.in/userfiles/files/xuzije.pdfIn PDF document text
    • http://status-go.net/gfx/userfiles/files/75372529574.pdfIn PDF document text
    • https://timminsrenovations.ca/file/uoCOmLFvFtWfYPla.pdfIn PDF document text
    • http://mygiftltd.com/userfiles/file/zasebusasatuv.pdfIn PDF document text
    • http://canphantich.net/Images_upload/files/sujukukilapagubenem.pdfIn PDF document text
    • http://www.its-dph.cz/admin/fckeditor/editor/userfiles/file/kawikesuwo.pdfIn PDF document text
    • https://newsru.md/upload/userfiles/files/tofabodusetokenefub.pdfIn PDF document text
    • https://thehouseproduction.net/file/xarinawifa.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612f1a9744aa4---dimexijujatowo.pdfIn PDF document text
    • http://xn----7sbakif2a3azdub.xn--p1ai/admin/ckfinder/userfiles/files/31554156419.pdfIn PDF document text
    • https://tkbhanna.com/ckfinder/userfiles/files/zofeliv.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/bddd07e4763d1eb603ed0006404a9d85/musinumavurobo.pdfIn PDF document text
    • http://machinesupplier.cn/data/product/file/202192_11130_983.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/e26660c69a48f2eb642f6184351e05ab/54043099408.pdfIn PDF document text
    • https://bunyaminerdemir.com/resimler/files/womitawegekekapidulegik.pdfIn PDF document text
    • http://originalbau.hu/imagesfiles/kosobaladaladi.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/16143a3b8ea4bd---jolusawupilawew.pdfIn PDF document text
    • http://osteriailgalloelinnamorata.com/userfiles/files/wumugowim.pdfIn PDF document text
    • https://xylemleads.com/userfiles/file/83883504244.pdfIn PDF document text
    • http://meubelenindex.nl/images/uploads/nubopozuro.pdfIn PDF document text
    • http://tikatalog.sk/_files/file/79843986550.pdfIn PDF document text
    • http://gapp.fr/medias/files/23543395407.pdfIn PDF document text
    • http://35ju.21tg.cn/uploadfile/ckeditor/files/vogedavekimadonufoxixab.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_off0000e39c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE39C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fbae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBAE 18444 bytes
SHA-256: 15dd866599d70ecfa2db959c2c020866f9d105f3daaf155378c0672987686cec
font_02_sfnt_off00012c64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C64 10176 bytes
SHA-256: 4ab04563875609c86b1fcb7aedb3bd0f128d7d7e1212fe95a9e01b5a474593d8