Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea6b9572991fa39b…

MALICIOUS

PDF

86.5 KB Created: 2021-09-13 21:07:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f850839cf32d610fdfaea82af0b68274 SHA-1: 846f65a6639ae6a152ca8a764635d094d6f078fa SHA-256: ea6b9572991fa39bd9a5ab68951c92d32f307856510336e592ccf24c223753f0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. Heuristics indicate it functions as a link farm, with multiple URLs pointing to PDF files hosted on various websites, some of which are identified as potentially compromised CMS uploads. The document body is heavily obfuscated, preventing a clear understanding of its direct content, but the overall structure suggests a lure to external malicious resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://guoyangmoju.com/userfiles/files/95661662336.pdf In PDF document text
    • https://commonlawhouse.in/userfiles/file/80600668433.pdfIn PDF document text
    • https://timminsrenovations.ca/file/TVIdROz0AOfiwcZ1.pdfIn PDF document text
    • https://pelicanfinancialnetwork.net/ckfinder/userfiles/files/luwatoperiguliruzotemew.pdfIn PDF document text
    • https://osikovo.eu/webroot/img/content/files/68592329668.pdfIn PDF document text
    • https://isagrinio.gr/userfiles/20998056110.pdfIn PDF document text
    • http://timocomputer.cz/files/file/bizoduxizatavidoxam.pdfIn PDF document text
    • http://tycoonmedical.com/userfiles/file/21431291123.pdfIn PDF document text
    • http://mweb.cz/images/file/68123441753.pdfIn PDF document text
    • https://bazab.ru/ckfinder/userfiles/files/kusuzavojofeputagagu.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/1613090b4d2ea0---zivutumor.pdfIn PDF document text
    • https://evermoral.hk/upload/file/1631303471.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b1d33705de---sewuzulotom.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613428e0ec67b---bidilawokuludurabaxubavo.pdfIn PDF document text
    • https://truckforceone.com/upload/editor/file/xirowawuzetawekumisulu.pdfIn PDF document text
    • http://gasasosong.com/upload/fckeditor/file/57385145504.pdfIn PDF document text
    • http://restauraceeverest.cz/userfiles/file/vewupe.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139e5998c5e2---latamef.pdfIn PDF document text
    • https://mmeasar.com/mmeasarfiles/file/wetukuxepem.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16132bb869b773---93903306117.pdfIn PDF document text
    • https://graphicart.ro/fckfiles/file/76254024414.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/10d230d8b88514c89966aacb9122a91f/85866600686.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=heartbeat+sensor+app+androidPDF 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_off0000ee51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE51 10472 bytes
SHA-256: 4b7c2cadff23e8c4aa5a54e61b78ba74c294160cdf65843c78052c81f9b8c463
font_01_sfnt_off000105ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105ED 17864 bytes
SHA-256: 5996e3e78f4db55b79bb30b098c596965a15a9780681792f6180e43d0520a977
font_02_sfnt_off0001341a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1341A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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