Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c61659fe09d0dfb…

MALICIOUS

PDF

86.8 KB Created: 2021-06-28 23:12:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 39b77329970df175cf6586381fa9f046 SHA-1: 15434fb32ae6fe9597c2eda28ee9dd77710f1f17 SHA-256: 6c61659fe09d0dfbb8f1dea4032156927a07615ba339e46c678f5c4978a3d4d4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple distinct hosts, many of which are associated with compromised CMS uploads or disposable hosting. The embedded URLs, such as http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/39e97de4ac02f2062057f5a137d81c1b/veroguruvitoxekajutadudon.pdf, are likely intended to host malicious content or facilitate phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1609b22453e0d8---92432652768.pdf In PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/093ed44b40ce168d742247237a1ca7a5/38360113192.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/vuxesogixilupomiva.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/39e97de4ac02f2062057f5a137d81c1b/veroguruvitoxekajutadudon.pdfIn PDF document text
    • http://ty-universe.com/image/files/20210617_200640.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b857521c034---rowugode.pdfIn PDF document text
    • https://hophamthaibinh.com/upload/files/dasedivilapujapaxus.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/d0a5a254fe71aa44c43fcfe424c7377d/29011620333.pdfIn PDF document text
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16095e951b0b60---47306550296.pdfIn PDF document text
    • http://robertoantoniz.com/resources/original/file/zurimikoxikeduganarupede.pdfIn PDF document text
    • http://studionegro.net/userfiles/files/fazenaxusobib.pdfIn PDF document text
    • http://centronegozi.com/public/92808817763.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/ceabafbdcab679149af2600a81ba029b/xukaturilumoxopewanebe.pdfIn PDF document text
    • http://nfrostov.ru/upload/files/10077868248.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608826b924513---26663857727.pdfIn PDF document text
    • http://flightshop.jp/images/blog//file/fadififivike.pdfIn PDF document text
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/b2bbd006784a0b98b3ae76b0dea8d711/musuvoresemulowa.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160944d4697ef4---60516712866.pdfIn PDF document text
    • https://ensasoft.com.tr/wp-content/plugins/super-forms/uploads/php/files/h51hdv2v17fmussma0e3er6a6u/6777174928.pdfIn PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/qgituciirr66p8i8qqfu7osno0/gukuwurilowaledimu.pdfIn PDF document text
    • http://murphysbeads.com/clients/54316/File/4140052754.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16097b2c44e866---19812244562.pdfIn PDF document text
    • http://bandenplaats.nl/cmsimages/file/pekuna.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=used+to+would+pdfPDF 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_off0000e7dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7DC 10224 bytes
SHA-256: 17595699f323399fd0945a599f2de6c01cca7535681984fdb9c7d4de4ce7bdf5
font_01_sfnt_off0000ff0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF0B 26884 bytes
SHA-256: 7a8940a686f3e2b507c4a324b78c56315e8ae1315ff0e9bc133be706d53506cd
font_02_sfnt_off00013645.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13645 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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