Malicious PDF — malware analysis report

Static analysis result for SHA-256 0595a878efff389d…

MALICIOUS

PDF

92.3 KB Created: 2021-09-04 04:27:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: adf259e832b28243275908e74577ed6d SHA-1: 7892fd7014c2bbae3f7942046aa6fb38b451ef61 SHA-256: 0595a878efff389dc83ae3c8225a698ffc074f2371985f0f3be27d5a47f7e948
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised CMS upload directories, suggesting it functions as a link farm to distribute further malicious content or phish users. The presence of multiple external URIs and link farm heuristics strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9906

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 https://atputasbazes.lv/images/userfiles/files/bajapuganusijumatefuwe.pdf In PDF document text
    • https://haciendaloscipreses.cl/upload/file/22600592650.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/8c08m26nhd202lc6dfl6qaeme0/15601988005.pdfIn PDF document text
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/f95c314f7b3ec9e4fd57729cb19c96a6/mogexitiderimud.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609c47a2107de---88249775984.pdfIn PDF document text
    • http://uss100.com/clients/5/56/562308f4da1da23328cfd9e5c9f3e68f/File/73627948929.pdfIn PDF document text
    • https://menu2uplus.com/images/file/risezupoguwanapogofuto.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/a385dc55936b774c949b675faa50f329/vedipofivuninuxuruguxupu.pdfIn PDF document text
    • https://kiaavcilar.com/upload/ckfinder/files/penawirupezusojeb.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc5a6eacd9---xegurudowagazepul.pdfIn PDF document text
    • http://mellorymotors.ru/admin/ckfinder/userfiles/files/11737479865.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609c19acac544---41594134285.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a6a856b2c9---pelepevotepowadi.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16096d75c14c58---dufozibetakubowikubu.pdfIn PDF document text
    • http://elyriahigh1974.org/clients/0/05/052ab20d644b737728595af1a47b4450/File/ximefeturedisivexeruvazu.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/eb2dc087006bc76a463b13e22ba72dfe/17683439867.pdfIn PDF document text
    • http://iltorg.ru/upload/file/dadumotiwuridudaxixo.pdfIn PDF document text
    • https://vegas-shop.net/uploads/files/nexepajokukeveloxame.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/5fafb6445eb21a279fb594f514cd88de/93157780966.pdfIn PDF document text
    • http://seibyou-koujien.com/files/files/sodefojojobofawa.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160719ffd57d36---89408411214.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16078b1015dbe0---77807061679.pdfIn PDF document text
    • http://shipsupply.ru/userfiles/files/24693656578.pdfIn PDF document text
    • http://arablift.net/userfiles/file/regusuzukejek.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/e99af424191f772859f99aeeeedb4d17/rusodazozog.pdfIn PDF document text
    • http://bugaboo-buffalo.eu/UserFiles/File/keranagofosazisitovugoz.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/egqge5nqpgtua4rtoac1r4p9tb/93563321924.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=lucca+comics+2018+mappa+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_off0001014a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1014A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001195c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1195C 19116 bytes
SHA-256: 74d997dc301fb9be922d9c792ad5f12b11bcb64a73c875b33564c1853c57d02d
font_02_sfnt_off00014a22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A22 10860 bytes
SHA-256: b7b6777744d6852d06a967a0c6bf117b86fc23047533ddcbe81b56c1c5ca345d

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