Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9f95f5d7b2e671e…

MALICIOUS

PDF

146.4 KB Created: 2021-06-21 09:02:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 7151f9ff9c4cf1a9c16a8612e5ac6aa7 SHA-1: a5684e700466c8ee95489db95736553635cbbc46 SHA-256: a9f95f5d7b2e671ef659ec41cf4297ae87c2a84e00dcd608c7050e03390c9ac0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document body, though partially corrupted, suggests a lure related to educational materials, likely a phishing or scam pretext. Numerous URLs point to compromised CMS uploads, indicating a distribution mechanism for malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cefc9a41b8---90803192240.pdf In PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c597adc8bd3---venugigisekegudaf.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/16077ab761a983---83903835740.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606c91e355bd1---tipawugasinezefanefurin.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/lqg1t3u82dhpih3se9pno0ea1f/4632790324.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/1e950793e855efc8fa01676d0d7e7f5a/20806499353.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160898d8c37ebe---negojuxefixomis.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/7cc962b9e09f8875748aa01c668f5575/siralisonakamazi.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/17ad3b303af405fe95a80e4ac44e5eca/lofolidovofotoxefa.pdfIn PDF document text
    • https://coil.hk/upload/files/begitilaturiroxarivoxup.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/oktq3tt7jj37nppnebipua57v0/bojesaboku.pdfIn PDF document text
    • http://oresteruggiero.com/userfiles/files/jikevebonatovadewevetojem.pdfIn PDF document text
    • http://komputerzagrosze.pl/userfiles/file/mivuxerulidejedimotuxu.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/0520fc51d938ae417b37188d1a21ca8d/50830946652.pdfIn PDF document text
    • http://penzionklara.cz/userfiles/file/duregedoranobulepa.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/482ed985179b94cfcc72aa1c037e23d9/12108274136.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=unseen+passage+for+class+12+with+answers+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://scripts.sil.org/OFLIn 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_off0001e98c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E98C 5684 bytes
SHA-256: 08b1188019ddb76cf533f4cc51c3f064e92a12004335d195756704c69d4b2ca3
font_01_sfnt_off0001fcfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FCFB 11644 bytes
SHA-256: 7133b80097ecda725689a62edc21b665258b4c76dc3784bb7beaefda25fe5aed
font_02_sfnt_off000224c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x224C5 16164 bytes
SHA-256: ead7fd593d7f5feef6f283420e9b55f8fa4552f107c64b0063d474dd3355abd8

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