Malicious PDF — malware analysis report

Static analysis result for SHA-256 389f24662f2a2999…

MALICIOUS

PDF

104.8 KB Created: 2021-07-01 11:21:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 0ff1da172d1e3d849a1f8031df68bf93 SHA-1: 725fa5862e386dca0fa3d66ebc8c62d9e51bf385 SHA-256: 389f24662f2a2999cdaa9997440f79d9d1035a175519d18311f0fb9f3c8ebcfb
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to phishing pages or download further malware. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://aslimitada.com/userfiles/file/gofotabuwapopuwaragoxe.pdf In PDF document text
    • https://zoldlepes.hu/userfiles/file/mujogozoratizoxasupiponuw.pdfIn PDF document text
    • https://tavio.ru/files/file/tolegu.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160b8e34b167e0---27864124048.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608a4f493edf7---56092926827.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/f07pc3849jbd0arb33pmbtrpoi/6137652839.pdfIn PDF document text
    • https://www.varisistanbul.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cd5456969a---tekamemesevulaxu.pdfIn PDF document text
    • http://naturallabs.de/userfiles/file/63916139988.pdfIn PDF document text
    • http://kapalishakti.com/ckfinder/userfiles/files/98395998688.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a703dfa077a---50772421293.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b689c75bc90---tifurixaz.pdfIn PDF document text
    • https://tlpnw.com/wp-content/plugins/super-forms/uploads/php/files/22893ad539850a80e57abebb69486c42/29809681749.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/0b040466ccc28762d6b4dedc75594b9a/57840259017.pdfIn PDF document text
    • http://kinel-hunter.ru/upfiles/file/pamijojeki.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082d2261ee8b---detudefekufoti.pdfIn PDF document text
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/8f4e634894fdb50a826d77d35aedf05b/rozel.pdfIn PDF document text
    • https://horgaszvelem.hu/ckfinder/userfiles/files/82469997410.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/160a8753f53384---zaxirobozigiwoluzonepo.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1608f3a1a1193d---lokutafizewekowufebofa.pdfIn PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/5hpp3qanm16jcou63a7j6tdglr/mazas.pdfIn PDF document text
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/d9b3f142fed9f630d812e5c5af91ce02/nabavokarofojadiporutebe.pdfIn PDF document text
    • http://atek-ent.com/upload/file/gusiselub.pdfIn PDF document text
    • http://rymwid-training.com/userfiles/file/rubaxupiselujejixiwogepa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=good+for+near+mePDF 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_off00013b1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B1F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00015331.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15331 17144 bytes
SHA-256: 0eeaf310f4c8936f2aea08ef4be2e8848f0c9be77150befbf87ecb6ba55cbdb4
font_02_sfnt_off00017fd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17FD8 10148 bytes
SHA-256: 064d6ca497b7ddd042c66357699a4cbc9845a487b4de4d7626f861113405d55f

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