Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5dcd1cce980cf0b…

MALICIOUS

PDF

119.2 KB Created: 2021-06-27 07:09:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: c796c08d09244c90f8f903bbf9d7f5b6 SHA-1: 375a3f3dfb6a8fd3a83d5a247c5652c45a100ef6 SHA-256: a5dcd1cce980cf0b0b9ad58450931d8a7e1de9a0ea78f25fa5fc47f8010cd798
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by ML classifiers and ClamAV as malicious. It contains numerous links to potentially compromised websites and is identified as a 'Recovery secret / private key request' lure, indicating a phishing attempt to steal sensitive user credentials. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristic firings strongly suggest a phishing attack designed to harvest private keys or recovery phrases.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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://mayurherbal.com/userfiles/file/dobavetupojiziwenoseza.pdf In PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ac1be404804---pukigusorezogi.pdfIn PDF document text
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/107d3df9f3f07f66c64b963a25be2566/tiwibeb.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609de01dae7d5---86604605533.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160731779de7d0---xaxarusiboxoged.pdfIn PDF document text
    • http://smartcevent.com/clients/871459/File/nuroniviri.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be882da290c---21907180267.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c918e607a6b---kumasibesagalokunofutikef.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/bq8mj802u9p5tgk4vi9cp1fs06/19079927291.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/16081cfaa94276---277100129.pdfIn PDF document text
    • http://dalaichau.com/files/pekusowazezudop.pdfIn PDF document text
    • https://artasedanasingaraja.com/uploadfck/file/vixevagoxodivewo.pdfIn PDF document text
    • http://boilerservis.ru/uploads/files/rujokewifak.pdfIn PDF document text
    • https://mosallaesf.ir/uploads/ck/files/kenimarunazomolufu.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608efea82fec7---dabasenejigikujegeku.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/16075e10dded90---50325326263.pdfIn PDF document text
    • http://mfcwestenkwartier.nl/beta/userfiles/file/toniti.pdfIn PDF document text
    • https://kopari.hu/files/file/napopurinifavipu.pdfIn PDF document text
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/16093ad066b13d---55192293557.pdfIn PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/16080f4832000c---wegexum.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=papers+on+cryptography+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_off00016f47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16F47 10876 bytes
SHA-256: 722d4b24f2035ae80141040b1991b6da8b91edb75a6a6c9587f3c8500e948146
font_01_sfnt_off00018836.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18836 19052 bytes
SHA-256: aec7bee0720cfff86a713a37f8240e4dca2423efb91e8a0fa974bdc93bfafc8a
font_02_sfnt_off0001b7e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B7E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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