Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8c26664056ecff4…

MALICIOUS

PDF

102.2 KB Created: 2021-09-05 09:02:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: fd3bf322531a600f94181d74731f9e68 SHA-1: e7cacea8b5d680658214d1547fc417b7bdffe6ee SHA-256: c8c26664056ecff4fb87cdcc17a2e4f0cd425bb491459a5517604f5fabcafbb5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised WordPress sites or disposable domains, suggesting a link farm or phishing lure. The PDF structure and embedded links are indicative of a phishing campaign, likely attempting to redirect users to malicious sites for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://archism.ru/uplcv?utm_term=part+time+manual+testing+jobs+in+pune PDF link annotation
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160c22b1d83552---5030169432.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/12f87c17a4f497e5b3f0c4275c78d6dd/63723861270.pdfIn PDF document text
    • https://cochleartudaskozpont.hufiles/57816442507.pdfIn PDF document text
    • https://needletherapy.eu/upload/file/sumagopojizalexixamoda.pdfIn PDF document text
    • https://lomasdelaweb.com/userfiles/2008.09/file/wolixuxopevoxunogisesis.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16114a27b7eb7d---3343952485.pdfIn PDF document text
    • https://hunde-katzen.at/soubory/32364630380.pdfIn PDF document text
    • https://universal4shipping.net/userfiles/file/godadewonijelex.pdfIn PDF document text
    • http://dangkydoanhnghiep.org/hinhanh_fckeditor/file/11768268141.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d9a8754406---83292250574.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/16116c2928dd86---73497199692.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e49bcc5ce2f---wudubawijokum.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/nc7j5oqorqj8v1tcg2k5volvb7/71866469254.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/1mgvrfck5d0rf1mgkr1hgt3715/regedobuxeji.pdfIn PDF document text
    • http://xn----7sbabaajmdfbk3ddf3azka3b6a2r.xn--p1ai/ckfinder/userfiles/files/48512857096.pdfIn PDF document text
    • http://ahlhy.com/uploads/file/021720428474.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/gobasowibugezev.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a85604ba788---bixobegavisomo.pdfIn PDF document text
    • https://gabinetpro.pl/kosmetyczka/krakow/files/xumawufepoxagefevo.pdfIn PDF document text
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/954b34036c794b2bfe2e707ac7760cf5/zelaxovuwatamajumotog.pdfIn PDF document text
    • http://ngocvietbungalow.com/upload/files/89789735469.pdfIn PDF document text
    • http://amdind.com/userfiles/file/58074384946.pdfIn PDF document text
    • http://hutbephottaihaiphong24h.com/upload/files/97989928284.pdfIn PDF document text
    • http://suankaew.net/upload/userfile/files/77135314961.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_off000129f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129F1 10968 bytes
SHA-256: 38583e864bfa08edb13a5fa169acaaa58044b15bcf3c8c477bbc926ef96d6714
font_01_sfnt_off00014320.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14320 18360 bytes
SHA-256: 9262f7ec745466bf31270ffd65d945d44e0e02efbd2f7b7541cdf99e438d48eb
font_02_sfnt_off000172ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x172EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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