Malicious PDF — malware analysis report

Static analysis result for SHA-256 2577f6d14e6f7ed4…

MALICIOUS

PDF

78.0 KB Created: 2021-09-08 18:03:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ba0d170e1d00fdc259e3416e6ed84c76 SHA-1: a61ee6a03731a58953be3270b70b226feea8b7cf SHA-256: 2577f6d14e6f7ed47de95a1332a952070def705a3f3d1218af6759c79bb85ecd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm designed to direct users to various external websites, many of which are hosted on compromised or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple PDF link farm heuristics confirms the document's structure is intended to obscure malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • 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.
  • 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://sushinamu.com/uploads/files/84466834578.pdf In PDF document text
    • https://landtop.com/filespath/files/20210907040951.pdfIn PDF document text
    • https://ezastupitelstvo.sk/editor_uploads/system/files/tatemopixedale.pdfIn PDF document text
    • http://domainecomps.com/documents/files/kamibituk.pdfIn PDF document text
    • http://aapltd.net/userfiles/file/63003064903.pdfIn PDF document text
    • http://zaiger.ru/img/file/wiladukojetubivadaleno.pdfIn PDF document text
    • http://airelimpio.mx/img/editor/file/99224573693.pdfIn PDF document text
    • http://struttur-arch.it/userfiles/files/pomokatexapagenopabi.pdfIn PDF document text
    • https://studyhalltracker.com/files/file/80496293648.pdfIn PDF document text
    • http://www.mostex.sk/files/articles/file/26350230149.pdfIn PDF document text
    • http://www.santabriganti.org/admin/ckfinder/userfiles/files/64432580700.pdfIn PDF document text
    • http://hanaelectric.com/userData/board/file/62554522559.pdfIn PDF document text
    • http://connect-senior.ch/uploades/userfiles/file/42767178138.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132eebdcdd89---wotiw.pdfIn PDF document text
    • http://jr-bang.com/uploadfiles/20210901053251.pdfIn PDF document text
    • http://www.lbtfilm.com/uploads/files/42375992860.pdfIn PDF document text
    • http://blackhorsesc.pl/userfiles/file/6054367588.pdfIn PDF document text
    • http://foodzipo.com/uploads/userfiles/files/gomak.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16133193b07cee---dukokaneka.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/vp51sqssibdn0ouk9tr5ofbihl/wibejopawidaratetibazixu.pdfIn PDF document text
    • http://votejoedestefano.com/editorData/file/dujutipifukebapupudojade.pdfIn PDF document text
    • https://valgott.com/images/userfiles/file/62848804717.pdfIn PDF document text
    • http://mcap.cz/images/uploadedimages/file/wagebux.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=estimation+worksheet+ks3+tesPDF 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_off0000cbd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBD5 10660 bytes
SHA-256: 90b432afc9d65d8318e9fe4fcd3300a4d62644f9feb1c61b1764d991d7ec882c
font_01_sfnt_off0000e427.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE427 17732 bytes
SHA-256: dfae2b3c5b3c2dc154055031dd93cb8ab12152cfabe899a0e13a0666077f0ffc
font_02_sfnt_off0001127f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1127F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1