Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f8614608b354d5e…

MALICIOUS

PDF

89.5 KB Created: 2021-09-05 06:11:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0f30793c8ebbbc39dfee9ebf512ddc45 SHA-1: d77e2f15308dad68b538cba353c8d718a26d98f1 SHA-256: 8f8614608b354d5eedf3388b9d4895d8e381d8976d145b8cc34e72cf99cd1062
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing lure. It contains numerous embedded URLs pointing to potentially compromised or disposable hosting, suggesting an attempt to redirect users to malicious content or phishing pages. The 'SE_INVOICE_LURE' heuristic further supports the interpretation of the document's deceptive content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://boschvietnam.vn/files/usersfiles/files/ribolowapo.pdf In PDF document text
    • http://scuolascifondocortinadolomiti.it/userfiles/files/78859486691.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/160d5aba610755---39915315974.pdfIn PDF document text
    • http://abogarestudio.com/userfiles/file/kunekozeke.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/43da70f54b49f50334f74b1f8169fc44/gogarugakekemekusagiposo.pdfIn PDF document text
    • https://assignmentmart.com/ckfinder/userfiles/files/98313538489.pdfIn PDF document text
    • https://seikai.jp/free_images/files/sazokasalurupibabar.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/160ae01d868f75---tagisugiwovivopadagamo.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8220635068---83590990214.pdfIn PDF document text
    • http://vietxetai.com/wp-content/plugins/super-forms/uploads/php/files/pd87dh3lor2s15dbk1k2obd15t/ketax.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a5188858b85---gixipoxirilaneritokep.pdfIn PDF document text
    • http://scro.ru/pic/file/magasomatovogu.pdfIn PDF document text
    • https://youkuvpn.com/upload/files/46677045487.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d75bc1028c6---37038397889.pdfIn PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/cf1e61bba1d1df56ac812371641a3d93/tutewerog.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6f5920bd19---bujevevafurefuwigukuxu.pdfIn PDF document text
    • https://heritagecambodiatravel.com/userfiles/file/bekibawaxipegavot.pdfIn PDF document text
    • https://www.artikel238.nl/emmwebbit/resources/ckfinder/userfiles/files/kafilewomebo.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/06d0fb0ba6119776ccfd125f57ccb4a6/lemowawaxime.pdfIn PDF document text
    • http://rococosofa.com/files/files/9968191572.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608c3c05d4f9c---lebinimutobozezadunoxorup.pdfIn PDF document text
    • https://fluffy-chins.com/images/file/95793207151.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/89188999840.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=car+repair+invoice+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_off0000fbd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBD9 17232 bytes
SHA-256: 288bbbdd9e0c06e81ec564139e209392bd30fc6dddf36773c3e2456306b6742c
font_01_sfnt_off000128e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000140f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140F8 10400 bytes
SHA-256: 6a6776844bce203098d3efd2782a38211056e0777905519eb20990be51df84bd

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