Malicious PDF — malware analysis report

Static analysis result for SHA-256 f84a8754d79b18c9…

MALICIOUS

PDF

89.4 KB Created: 2021-07-31 15:41:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f108e7d27efd8049ad993986e9cbdf61 SHA-1: b86def73c4df020a3789d894859848fe2102e7ba SHA-256: f84a8754d79b18c9ad45bbb64347db61151a3b30a0fe53a7273cbbe5b45a15fa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links indicates an attempt to lure victims to external sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/235a50a5b42e69cb099bd4d872667767/31617194098.pdf In PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1e52bc7ea6---6226626498.pdfIn PDF document text
    • http://dintainoodle.com/uploads/files/dijoruwajeruf.pdfIn PDF document text
    • http://ankamet.com/userfiles/file/14454792343.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/qg1u4ujs7k3k14ge0v3biskap0/44077861993.pdfIn PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/oua5sd2fh3s56gcflbo937gvdd/xejasuxesenebubukukoza.pdfIn PDF document text
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/e6c59907f60e67f70cf22e204dcecb5c/pesesixeweligeziw.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/nk1tk3snd54cecjgi8k6qdbgj4/figodixojineguvemu.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/b4cvggvr9jln8472lrn0jvjtv0/vavofi.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/f3b9c5d42b57169ea2752d5018c45de4/63675408069.pdfIn PDF document text
    • http://i-daa-wl.de/userfiles/dolikodu.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/812df75d9302377d1b2ebeb3649b57fa/jewukazawegavagod.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f0d5d519061---9030898680.pdfIn PDF document text
    • http://arcdesantmarti.com/biocop/Images/images-editor/file/gagofarulidagoribivaxuluj.pdfIn PDF document text
    • http://www.vnos.vn/app/webroot/uploads/files/43679054854.pdfIn PDF document text
    • https://traonguoc.vn/wp-content/plugins/super-forms/uploads/php/files/dfflb7df41hmog5rqeb91ripnh/27915044033.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160d5bdef481b4---duzanib.pdfIn PDF document text
    • http://originalcheck.it/public/img_admin/file///61647592642.pdfIn PDF document text
    • http://ncabhsa.com/clients/875427/File/65929635973.pdfIn PDF document text
    • http://schokozentrale.de/idata/fapupejolur.pdfIn PDF document text
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/27a7sneh3obo5e6c5d96anaqn6/mipukibajekurixe.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a006f3ca630---63051712131.pdfIn PDF document text
    • https://dangeloremodeling.com/nbloom/fckuploads/file/negowufupepe.pdfIn PDF document text
    • https://louvre.lv/res/wysiwyg/file/vawidirekipalafopisakenu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=how+to+survive+tomb+of+annihilationPDF 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_off0000f8c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8C3 10860 bytes
SHA-256: ad117bc79625add49760361e69fc6ee909600755ac4d5b44755784cf245f4adc
font_01_sfnt_off000111b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000129c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129C6 17584 bytes
SHA-256: afdfe5c15ba6501ce57bb8c214ef96bc3c719066bf14b021af4b678daa5a0451

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