Malicious PDF — malware analysis report

Static analysis result for SHA-256 e026699ab447ac33…

MALICIOUS

PDF

90.3 KB Created: 2021-09-17 21:59:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: a8381824fa2a86882434bbdacc4691a8 SHA-1: 11f76bd5734b843fe4f005667ba53ae779864e64 SHA-256: e026699ab447ac334673b7f9a4b0267681d70df35b12855cdf63f0e3726c90cc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://chcial.ru/uplcv?utm_term=zm%C4%9Bna+v%C3%BDchoz%C3%AD+aplikace+android PDF link annotation
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613f906c257a6---58358925246.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/1612f170a7706a---55764487000.pdfIn PDF document text
    • https://omnistopbollards.com/application/third_party/ckfinder/userfiles/files/nopiwi.pdfIn PDF document text
    • http://kleinschadenexpert.de/userfiles/file/79037690044.pdfIn PDF document text
    • http://abaj.cz/UserFiles/File/89733795989.pdfIn PDF document text
    • http://hantechwelding.com/userfiles/file/2021090707022773499.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/b46a1eb7c6ddc0d7abb5f1b3b5608403/sixinaxutoxomimovibofu.pdfIn PDF document text
    • https://jin-ji.com/upload/files/jijomunamizodore.pdfIn PDF document text
    • http://elektromig.pl/userfiles/file/647101602.pdfIn PDF document text
    • http://thietkewebbacninh.com/webroot/img/files/jijuloberesegeruvapuw.pdfIn PDF document text
    • http://tdsns.ru/userfiles/file/muwewebodeko.pdfIn PDF document text
    • http://deborahkay.com/ckfinder/userfiles/files/nuvebupugugusazuton.pdfIn PDF document text
    • http://phongthuydotho.vn/upload/files/goforox.pdfIn PDF document text
    • http://wernitznigg.at/files/61723002085.pdfIn PDF document text
    • http://mpwlawpa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/26569969337.pdfIn PDF document text
    • http://hondasushi.com/uploads/files/50601066213.pdfIn PDF document text
    • http://humansharehouse.com/userData/board/file/15593365430.pdfIn PDF document text
    • https://selapro.com.au/application/third_party/ckfinder/userfiles/files/fibevuzafavifafegexur.pdfIn PDF document text
    • http://neza.cz/UserFiles/File/98737813196.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614097b6374c8---pujujeradidevuvofa.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/6f19dc14b335ed44b3ea9f4eef2a0bc9/jazebatimuwakeriral.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/161324dec0e1df---tekojaforirulogegala.pdfIn PDF document text
    • http://kustari.net/userfiles/file/debimafuxaxitujo.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://www.microsoft.com/cs-cz/windowsVyv��j��MicrosoftRodina��OSWindowsIn 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_off0000f646.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF646 11052 bytes
SHA-256: 1f444eaeada8c762025c1307b0165c6960628165f7608ca576703d9c9f1f617a
font_01_sfnt_off00010f6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F6A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001277c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1277C 20164 bytes
SHA-256: 5d5511f6ca11281561663448075ea2ab0d94d3143a229fea07dfa2b67a6f7eb2

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