Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ded0434ba86467c…

MALICIOUS

PDF

87.0 KB Created: 2021-09-01 08:18:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3a915c18b913793303c170b2c814d6f7 SHA-1: d584852a51a52247d0cbc00e2a4bf328c18d88ee SHA-256: 9ded0434ba86467c6f9b8a50dfd9c05244d19c42d4077779564b461ca845666c
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm or phishing lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically indicates the document's structure is a link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c92fb1591e2---benijigubabilipegil.pdf In PDF document text
    • http://luisacortesearchitetto.it/userfiles/files/79727609472.pdfIn PDF document text
    • https://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/02f276280ec8c9d0a7348c369111acbe/98692033303.pdfIn PDF document text
    • https://sonntag-immobilien.lu/userfiles/files/79764223450.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc33cd6e450---10886967903.pdfIn PDF document text
    • https://ltssinternational.com/res/wysiwyg/file/kojarebajeniluwa.pdfIn PDF document text
    • http://uptownchantilly.com/uploads/files/faxizezujav.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e94bb82816---bodiriperuwon.pdfIn PDF document text
    • http://erbamedica.org/userfiles/files/40776698170.pdfIn PDF document text
    • http://ballmillfactory.com/d/files/rolofez.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/file/56204730735.pdfIn PDF document text
    • http://usateatop.com/_upload/files/bijilipujirivebosaxavun.pdfIn PDF document text
    • http://wanyuantemple.tw/userfiles/file/17597879580.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610ebe25ee452---gitiviwapalimunejulez.pdfIn PDF document text
    • http://angeladaniel.eu/uploads/files/visuzatolo.pdfIn PDF document text
    • http://macabrey-luthier.fr/data/Files/39303064442.pdfIn PDF document text
    • http://sartor.ru/upload/files/36090128813.pdfIn PDF document text
    • http://sushigonewildtogo.com/uploads/files/samasefogawobiwalakusim.pdfIn PDF document text
    • http://accapierre.it/userfiles/files/28537312791.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/a0ca29ar152hmgvpdmr8iu6qc5/pezubix.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609ef59a6e94b---ribamitirivanasapinujeget.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/c52d375819e7831954d5f4f2a850536c/88723644999.pdfIn PDF document text
    • http://wangguanhardware.com/userfiles/file/dunajagelalorewuteg.pdfIn PDF document text
    • http://longarmquiltacademy.net/fckeditor/userfiles/file/2393028279.pdfIn PDF document text
    • http://lovesenergy.nl/file/44684777598.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c0b72c5ec33---4157357473.pdfIn PDF document text
    • http://www.cottagegrad.ru/files/file/zerutavisutarakajebib.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=when+to+use+direct+and+indirect+object+pronouns+in+spanishPDF 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_off0000e994.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE994 19756 bytes
SHA-256: a053e764f95c20ab6f5a592318f75dd98e7f48f272469c1f06be66602ee7a130
font_01_sfnt_off00011c7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C7B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013492.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13492 10928 bytes
SHA-256: 6dbca27b20cc05cbc5f8dbaa9e4679d3d70c5b19422cf737b1eaf3512e99e00f

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