Malicious PDF — malware analysis report

Static analysis result for SHA-256 c74dd695e7729a58…

MALICIOUS

PDF

88.3 KB Created: 2021-07-14 02:15:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 170b3742f56ae1f2152164df6436e0b0 SHA-1: 2f780fe0df3b34b72ddca170dd21869442c07a94 SHA-256: c74dd695e7729a581570f93b8f05ccdf63011a32f8121342ade1238f40e3235d
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous links to external websites, many hosted on compromised CMS uploads or disposable domains, indicating a link farm designed to redirect users. The presence of these links suggests the document's primary purpose is to lead users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a39f04531dd---wogegolegibodedabexesi.pdf In PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7889b5ea50---fekunilukunibavo.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/dofunixevivovosi.pdfIn PDF document text
    • https://xistenze.com/files/files/forabikudoxajotupanadul.pdfIn PDF document text
    • https://vansuloi.com/uploads/userfiles/file/xevovosokalirakenigumetug.pdfIn PDF document text
    • http://maihome.hu/admin1/file/maxukobelolikepesoduruw.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a99c7e5646f---lugitugafipa.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/38a2ea8fcd32498098ee9dc70ede20eb/30331544390.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/87bd4ae4b49c365403c98062d026c98f/tadomanu.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/fvig8sols3atn45oj6oso7ddjs/35581973788.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/b0l3jovik3dmkqrueb5eqjbka6/50651755260.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/fkcfgl90oh8vm9njo3h4b97gr5/94121519039.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/a5a24148bb2cc0e88a0a8d7f9ad58039/nibidegezolaxevorumewetor.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083cbe3eb49d---kinobogefikudobal.pdfIn PDF document text
    • https://webmenuplus.com/images/file/nisetekuvidevawabiloso.pdfIn PDF document text
    • https://dreamscapes.ca/dream_scapes/userfiles/files/62678931924.pdfIn PDF document text
    • http://kibbkw.com/uploads/file/52723325949.pdfIn PDF document text
    • http://wenxuezj.com/images/File/fefamogupuk.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2b40b93a1---vopivobovofotuj.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/tagukofikisisubekukugal.pdfIn PDF document text
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/bbkim1gv05g4i88beklq466sjs/15323961014.pdfIn PDF document text
    • https://readandenjoy.ae/userfiles/files/21769988402.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/vb35i56b6d6r6k4kmd8ohoals1/wupakuw.pdfIn PDF document text
    • http://grappin-annat-como.com/userfiles/grappin-annat-como.com/file/92545274813.pdfIn PDF document text
    • http://k-yoga.org/file_upload/spaw_upload/file/20210502195911.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=accounting+for+put+options+under+us+gaapPDF 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_off0000f7f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001100a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1100A 16496 bytes
SHA-256: 711a41cbc8b959e4912f694b3f71ff60227b963017141573d33eb21793e1b45e
font_02_sfnt_off00013a9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A9B 10828 bytes
SHA-256: 96b5a568b39a072d21226d6c8f4881d8e33152cdf17db34f0968b7ebbfceef12