Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ea09679037d5a19…

MALICIOUS

PDF

83.4 KB Created: 2021-09-21 00:30:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 7a56b214a2480c556029fddf9a909d0a SHA-1: 59a7ee3cccd90c2e44b0fb15968717fe4c2cef93 SHA-256: 8ea09679037d5a198fa27b500dadfc128da88c442c9d9cdd9e055a4c7b1e13aa
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The document contains numerous embedded URLs, many pointing to compromised WordPress upload directories and disposable domains, suggesting a phishing or malware distribution scheme. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://coretry.ru/uplcv?utm_term=how+do+i+update+my+android PDF link annotation
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/161368cbd4ec95---ritomesokidavoteluw.pdfIn PDF document text
    • http://library.nesdb.go.th/ic/admin/ckfinder/userfiles/files/lirovagem.pdfIn PDF document text
    • http://ssatripoli.org/userfiles/file/kitojipixatowimidifam.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614364aa3b980---31222917464.pdfIn PDF document text
    • http://dunakeszi.varosom.hu/userfiles/files/siriresizuxarimevirututiz.pdfIn PDF document text
    • http://nail-free.com/ckfinder/userfiles/files/25379573035.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ce4e50c511---muwepuzewol.pdfIn PDF document text
    • http://nfrostov.ru/upload/files/18438196973.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/161362c093dd89---6841068192.pdfIn PDF document text
    • http://wadsoda.com/UserFiles/File/fowobovagenisanoxeg.pdfIn PDF document text
    • https://wtmasonry.com/ckfinder/userfiles/files/kaxekakavorujetixisufolib.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/wafekenef.pdfIn PDF document text
    • https://polresseluma.com/assets/ckfinder/core/connector/php/uploads/files/febuwuturolifulobil.pdfIn PDF document text
    • http://gabinetortodontyczny.eu/userfiles/file/gisusuxumemonikefigug.pdfIn PDF document text
    • http://architettotamborra.eu/userfiles/files/18945016678.pdfIn PDF document text
    • https://processwork.archerhuang.com/ConImg/files/47481882775.pdfIn PDF document text
    • http://liburnia.pl/userfiles/file/19772392828.pdfIn PDF document text
    • http://yuanjen.com/ckfinder/userfiles/files/49795252063.pdfIn PDF document text
    • http://www.smartlandgroup.com/ckfinder/userfiles/files/79687756623.pdfIn PDF document text
    • http://hurtglass.pl/upload/file/wotoduka.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/slpj71s1qil0tg24ps0pep4t53/93661643276.pdfIn PDF document text
    • http://ppfi-online.com/userfiles/file/97947104834.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://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_off0000df70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF70 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f787.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF787 10632 bytes
SHA-256: 326d7f15e9afb9f53e6a786888aa059345b69cdf2ed950f41df7477713de43ad
font_02_sfnt_off00010fd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FD6 18440 bytes
SHA-256: 7928de49e255f500a7ffe4aec1908b5724082de2b15da5ecbed8770ef37d046f