Malicious PDF — malware analysis report

Static analysis result for SHA-256 426bf499b39b5ea9…

MALICIOUS

PDF

89.7 KB Created: 2021-06-26 12:47:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4e65147906fc213beac95821e1d25ddd SHA-1: f99ffdfc59e239d96422ae698b0b17a82c29af4d SHA-256: 426bf499b39b5ea99b097eed6aee26b63e3ffc9ba6d3fb37cf2546cf995638f9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, indicating a link farm for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eee5f707bf---mesadimedanozuwumimax.pdf
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a724f918946---17469239676.pdf
    • http://clinicaveterinariaalbese.eu/userfiles/files/57348850598.pdf
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/1609e160aa29d7---pudanoxutiwagewuzubewudeb.pdf
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/k69fuvs565r9denim9eleulcff/lufupawivojefi.pdf
    • http://china-hold.com/UploadFile/file/20210515044414753.pdf
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/60293d459e8116544297a6f64dd6b6a1/mavagologawuberep.pdf
    • https://alianzatours.com/imagenes/file/11805388111.pdf
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607041c52d45a---favamumikegoxidokifo.pdf
    • http://shannonlakeestates.org/fck_images/file/85790531442.pdf
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d288d222c4---metopi.pdf
    • https://mn-lawfirm.com/box/userfiles/file/65340765042.pdf
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bed37da199e---belosukesopejuv.pdf
    • https://alamansyria.com/userfiles/file/6110584245.pdf
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079329c0186c---lobebi.pdf
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/d81495f855e9358f2322212790104977/jufoxubazifomi.pdf
    • http://aite-materials.com/upfiles/file/tidosuzavelavinawegida.pdf
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ee21aa56a0---27716124853.pdf
    • http://nsdadventist.org/FCKData/file/jamenegomowasuxiteronete.pdf
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160b54bdfdcae5---siwimexaf.pdf
    • http://kurskodkb.ru/page_edit/_samples/userfiles/files/zajowitewudupesigaripam.pdf
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/cf9cc959ef11a7283d1a7a6cce0bbc5b/libugukitasifamuv.pdf
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/00861b925c9befd1cb321b5a60638ced/tonumexoximizotewadobem.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=dr+irfan+syed
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ffa5.bin
6dacc1e72a956f6b32b2bec636d8963c3e449332a9045bb77cbe55fa3c8d49cd
pdf-font-stream PDF embedded font (sfnt) at offset 0xFFA5 16584 bytes
font_01_sfnt_off00012b03.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12B03 16792 bytes
font_02_sfnt_off0001431a.bin
768ca6ada23eac0cd59cef273f206061c52f7fbea359bb8ec21163f16bfa6a99
pdf-font-stream PDF embedded font (sfnt) at offset 0x1431A 10200 bytes