Malicious PDF — malware analysis report

Static analysis result for SHA-256 99549de62dcb435e…

MALICIOUS

PDF

77.4 KB Created: 2021-09-04 20:04:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 293d8fc71b9d1840ec121cbdd68dfc10 SHA-1: f7d5a793e66863ee61f3f7fd2a92911bb6ed7832 SHA-256: 99549de62dcb435e699d03960aa2a3c0eee2776e1be2314bb4e7b7ed0696db0e
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The document contains a link farm pointing to compromised WordPress uploads and other disposable hosting, suggesting it is used to distribute malicious content. The 'SE_CALLBACK_LURE' heuristic indicates the document attempts to trick users into calling a phone number, consistent with phishing or tech-support scams.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/161104cb8466ed---7332192643.pdf In PDF document text
    • http://annabarons.lv/files/files/125606378.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16073bae277b61---rikaxazunirinuzodunopubo.pdfIn PDF document text
    • http://fresh-j.info/images/uploadedimages/file/rafupewesademipanofirar.pdfIn PDF document text
    • http://weiken-rc.com/upload/files/lorotekumepowuvubije.pdfIn PDF document text
    • https://info-jimukyoku.jp/lot/upload/files/10701212533.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/5jkjts9ter60jfanrnh3qtp0l3/maxanegivuropexafaketob.pdfIn PDF document text
    • https://vivaldiroberto.com/img/files/mediafiles/file/62139792703.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c1e8364ceb---64576358130.pdfIn PDF document text
    • https://yaofangpeixun.com/upload/files/lizifu.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/b6e759f94ebbe1020c92224f32435bef/labanolotixalewi.pdfIn PDF document text
    • http://festacreativita.org/userfiles/file/jurimufux.pdfIn PDF document text
    • http://ndt-tl.ru/upload/file/58070776639.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160b42e3e260cd---71122476060.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2f395c5a93---87283491505.pdfIn PDF document text
    • http://fly.no1-yes.com/userfiles/file/wibiwutulubefu.pdfIn PDF document text
    • http://kipia-nn.ru/userfiles/file/30279436541.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/3f5pd1b0jb3ai6hjmcsfomg5t3/fijanekuzonazufogevirasup.pdfIn PDF document text
    • http://zjhywt.com/images/upload/File/16400666459.pdfIn PDF document text
    • http://korean-school.hu/hangul/userfiles/file/sujumakuno.pdfIn PDF document text
    • http://gibisch.com/files/files/rowuxeroronomofuleje.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=livro+complexo+de+edipo+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_off0000c98d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC98D 19492 bytes
SHA-256: 70283e08ce3fde8582170f6de817f0fb3250a320be68b58cf8394eafc09d6ec5
font_01_sfnt_off0000f8d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000110ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110EE 10372 bytes
SHA-256: cc4796b73d89fb324e9448b9e90e12f636761b6995d80f1957281aa219d98c65

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