Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b61bbbb95aaf450…

MALICIOUS

PDF

98.5 KB Created: 2021-07-19 19:07:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7e8d6f96cdbf0fafb3a48d83a03c627f SHA-1: 1a44f579885c21042156cf398e4375db9cee5a0b SHA-256: 4b61bbbb95aaf4501ca77f89b4a55e24d8e458303f0004b45031974d4f29ffeb
96 Risk Score

Malware Insights

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

The PDF contains a link farm hosted on compromised WordPress upload storage, aiming to redirect users to malicious content. The ML classifier strongly indicated maliciousness, and multiple heuristics identified the document as a link farm on disposable or compromised hosting. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b26b75304f0---57145655393.pdf In PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/iohamjm54k4blj5m01n47pfg5t/42846633720.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609d708f9818f---tovon.pdfIn PDF document text
    • http://ventilatoryzlin.cz/images/file/pedezegatevotuwusizar.pdfIn PDF document text
    • https://sgotomotiv.org/upload/files/27206228924.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f934ed1848---tinejunetogonaputubu.pdfIn PDF document text
    • https://kovosluzba-praha.cz/res/file/85598677378.pdfIn PDF document text
    • http://scottsdalehighbeavers1978.com/clients/80197/File/13924398869.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/02ba0b15fde4bf950eec23cdb66635a9/jusaro.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/ba56d8fe87ba344cd745f424311e69b5/nejimolola.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/a1nh9tusbv5agjtco9freo5137/625674354.pdfIn PDF document text
    • https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/eefc99b54f518b1dcd8289ee10116579/71668334560.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/160945b6e00737---59191892088.pdfIn PDF document text
    • https://kildevangen.dk/files/48845848864.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609dbbd6f35d3---98538854050.pdfIn PDF document text
    • https://dovolena-jiznicechy.cz/uploads/90752596426.pdfIn PDF document text
    • https://pointsourcegroup.com/wp-content/plugins/super-forms/uploads/php/files/2e7c6523fc1a1c88332cfc2f03d0e404/42549409918.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160883a019b4fb---xuzixe.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/bmeobhg73t4hdqm1j1j11ngvpl/vatobirajibik.pdfIn PDF document text
    • https://wavesmaroochydore.com/wp-content/plugins/super-forms/uploads/php/files/6rpv1ljhlo3dbftegao5kit1a3/fagofirasujowumivab.pdfIn PDF document text
    • https://commonwealthsportsawards.com/userfiles/file/59271369791.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/d97db3ef4c0dfc3a63b2db16aff70ee3/37698575908.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=best+heart+touching+thoughtsPDF 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_off00011bdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BDC 10616 bytes
SHA-256: aa3e39ba049f074f59a868173b894d4a1fe25cd93b0e314c5b99b8aca872c320
font_01_sfnt_off0001342b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1342B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014c3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C3D 18888 bytes
SHA-256: 5da1b9a97f43b462232b95229a959160d09ad123462de726b1001bcdf0fe510d

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