Malicious PDF — malware analysis report

Static analysis result for SHA-256 8000dfd30f38a6d2…

MALICIOUS

PDF

100.5 KB Created: 2021-07-06 23:07:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 33936aefa31ddf1496c3618dad4cdf0a SHA-1: f492ff3498ecebe6c61d5c68e371a1f5a69f30d6 SHA-256: 8000dfd30f38a6d2ae4b6601ec1a7fee630ae5814db93c9127d55b0755f17ec6
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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 http://zs-oilfieldequip.ru/d/files/liwasepiwinugi.pdf In PDF document text
    • http://isvpro.com/custom/files/vopukurenebarezebejodini.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ed2cb0d6af---vazetiwin.pdfIn PDF document text
    • http://abaj.cz/UserFiles/File/kutetexozurumedol.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/67bd72bdcdbec85b2df7998465feb78b/24829879425.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/lo5nrlub97klcnvct27onmj6vd/zureraku.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/160c56a1732fd7---62522699272.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160707dd712a4b---21569882614.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/fb78fdeb3a80e69d6854c47e4e074e52/85792627070.pdfIn PDF document text
    • https://aspaeng.com/files/image/files/jovemesegerebil.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/porig.pdfIn PDF document text
    • https://travelworld.ro/userfiles/file/netefewupokupefube.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b4c5b17aa66---97624336152.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/libujexasor.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/obtio9n43a6857j1kc1ktmugiq/16316258575.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609489e5a0ac7---dabunawuxil.pdfIn PDF document text
    • http://orvosvalaszto.hu/uploads/files/64840337310.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/caaea0822475c4937221cbf7a7154f17/70789725122.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/an767nstt5js058rerajvba4n3/65392027354.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/778539220c899ddebc5baab5d8101010/mejowipiduviwolofebab.pdfIn PDF document text
    • http://polskienarty.pl/data/aktualnosci_imgs/file/binixinawejusamova.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b95c626e796---7512639961.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/80726540605.pdfIn PDF document text
    • https://muguet.fr/sites/default/files/file/69599193099.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=social+media+reading+comprehension+answersPDF 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_off00012432.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12432 17408 bytes
SHA-256: 5910d27fa98e2e7a56a673a45c91b2ef46ab8791528b24635160a20ce9804176
font_01_sfnt_off00015182.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15182 11024 bytes
SHA-256: dd5ef1074e6efa8b3bc28cd92c689434c521cb960010730242b84a5d36805f15
font_02_sfnt_off00016aaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16AAF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1