Malicious PDF — malware analysis report

Static analysis result for SHA-256 85ef4a4222e7db75…

MALICIOUS

PDF

95.6 KB Created: 2021-06-26 15:06:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 30e78c8afe9fe11d2aa78d6e2bd2d706 SHA-1: 3ff3078e00a196187cea6b4735fa460479db2c43 SHA-256: 85ef4a4222e7db757ca9ea265a7a3b8876fe19fb28f6038ce68402b94e81c750
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning model indicated a high probability of maliciousness. It contains numerous links pointing to compromised WordPress sites and other disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and link farms indicates an attempt to lead the user to a secondary malicious resource.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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://techhssilverbuffs.com/clients/61416/File/galujatokololenoxagu.pdf In PDF document text
    • http://vzwsportenmuziek.com/content_docs/1337497318.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/0652aaaf21c4d9d7f9df33961f3c45de/tokojokupozatexes.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/14720650372.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/sr4f12ag12mauk66bfqv66td14/zoxemox.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/60493103110.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160814dfc8e8a9---xidetojoveluxoli.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/3f3e63d9bfe480b4452237b344d58af5/devebogemoj.pdfIn PDF document text
    • http://hasyo.net/files/file/wiwavesapakiruvotiju.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a05d68dddcc---gasukerubamopigox.pdfIn PDF document text
    • http://vasvaripalmuzeum.hu/upload/file/96200995104.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/ldd0ecp63outqak3qargf3p7f1/xetejek.pdfIn PDF document text
    • http://oreade-breche.fr/userfiles/file/lamozoxeduxitokunoxe.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/575009e889ee9412fb5f6a2281ee27ff/92133505285.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/2guvlchf44ngnc86j3a7se0rp0/tixaxukanutufefa.pdfIn PDF document text
    • https://thefertilizerequipment.com/d/files/lubopif.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cb0454ad850---farojerupimulisivu.pdfIn PDF document text
    • http://panziofabian.hu/fck_kepek/kazegam.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/49c09f12d3eb6eb126387d3731149cf8/50405591392.pdfIn PDF document text
    • http://4bx.pl/public/file/32894892363.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/r9fp6q3f96t4c2n91ukv7gait2/loruwezoru.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/160875b3cc2c3a---51687466002.pdfIn PDF document text
    • http://ever0036.com/assets/uploads/ckedit/files/20210529051212.pdfIn PDF document text
    • https://pensiuneavlasin.ro/wp-content/plugins/super-forms/uploads/php/files/k9md253dm8l9g45628gqb5b1i5/90615748153.pdfIn PDF document text
    • https://southernlightingsource.com/wp-content/plugins/super-forms/uploads/php/files/9207eafeea6c36ee8fd5f9969d259b22/70652219842.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a82972a297b---41647366305.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=how+to+summon+the+frost+legionPDF 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_off0001115b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1115B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001296d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1296D 17964 bytes
SHA-256: 02f924cb74659912b5b0ee7b8bda2240647109f0b18bbba62d0bdf80af3cd832
font_02_sfnt_off000158b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x158B1 10676 bytes
SHA-256: 8b759a61657d79bb3b123f5d82051e74d9c38d9a131ddebc74dd1c2ca59b07a9