Malicious PDF — malware analysis report

Static analysis result for SHA-256 07284eeb658e4302…

MALICIOUS

PDF

82.0 KB Created: 2021-09-03 11:09:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6891149be19daaa22164ddcfa68fa4c8 SHA-1: 6a7240a3226283a8f1970ee8df5a29cb3f2a3bf7 SHA-256: 07284eeb658e430237d019cc4d723f076840b2be7911d0096fc0aeaa82f817e0
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as containing a link farm pointing to compromised WordPress uploads and disposable hosting. The ML classifier and ClamAV also identified it as malicious, specifically as a phishing trojan. The embedded URLs likely serve as lures to trick users into visiting malicious sites, potentially for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://synerhu.ru/uplcv?utm_term=church+of+pentecost+2019+theme+songs+pdf PDF link annotation
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16072cba28ceff---xazazonilox.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/b16e39acb351bc173fa1e9c52b239a0d/loferazinemonenedefegemev.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/494a5f26b0964953bfa3286cb537a99f/sukujaxo.pdfIn PDF document text
    • http://holzbau-napetschnig.at/6322783089.pdfIn PDF document text
    • http://matras-devison.com/upload/file/75779496338.pdfIn PDF document text
    • http://mywayrtk.info/userfiles/file/40647461795.pdfIn PDF document text
    • https://glory-aqua.com/userfiles/file/xugakosuvumuresugobew.pdfIn PDF document text
    • http://video-cycling.de/files/file/4682386082.pdfIn PDF document text
    • http://timandlor.com/userfiles/file/82105061921.pdfIn PDF document text
    • http://lahma.pl/_u/userfiles/file/fawow.pdfIn PDF document text
    • https://dehayemek.net/upload/ckfinder/files/mirezajaxado.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf830439ea---mamolizaxovogilutenaduf.pdfIn PDF document text
    • http://busankid.com/webfiles/board/file///zijavuki.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071ae036ddf1---93993137763.pdfIn PDF document text
    • https://sherwoodchamber.org/ckfinder/userfiles/files/wesagokuvovisivoraw.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c473d02b484---niwopaxofadutiweritasoj.pdfIn PDF document text
    • http://vladjurnalist.ru/archive/file/gibarezatekujan.pdfIn PDF document text
    • https://mama-light.net/business_school/uploads/file/bemerupatadezovurel.pdfIn PDF document text
    • http://se-ty.ru/uploads/userfiles/file/41461648715.pdfIn PDF document text
    • http://reversetheclocknow.com/ckfinder/userfiles/files/lufos.pdfIn PDF document text
    • https://berbagiangka.com/contents//files/97582963790.pdfIn PDF document text
    • http://sherwoodchambergolf.com/ckfinder/userfiles/files/disax.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_off0000d6ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6BA 18768 bytes
SHA-256: 7d95550a37de0971ba467346eb491f26856fb64c7b56af0d931cf5e7de3b9d09
font_01_sfnt_off000107b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011fd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FD0 11360 bytes
SHA-256: 832790cf2cb2647291580620c624dca95596cf5626a99e0ae60f94dfeef4d72c