Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c992f7559ecddff…

MALICIOUS

PDF

73.7 KB Created: 2021-09-07 20:25:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 906728437db4bb3e9d5fca9e0bd91b46 SHA-1: 90835dee026f053b5bff473489a5a4f1b559ad82 SHA-256: 9c992f7559ecddff37af16830e48618f0283c8baef7dfda90f3d8a2f7f47f102
156 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV, indicating it is likely a phishing or malware distribution document. It contains numerous links, many pointing to disposable hosting or compromised CMS uploads, suggesting a link farm designed to redirect users to malicious sites. No scripts were extracted, but the presence of external URIs and link farm characteristics strongly suggests a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://change4best.ru/upload/file/6407172884.pdf In PDF document text
    • http://botosani.ro/img/uploads/file/94086853063.pdfIn PDF document text
    • http://campingwithconvenience.com/files/files/binod.pdfIn PDF document text
    • http://cx-gl.hu/images/files/jibiluzosuvarurakatuv.pdfIn PDF document text
    • https://asharfilalkulfi.com/ckfinder/userfiles/files/75538506036.pdfIn PDF document text
    • https://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/773l1bohjkst7lf7j1aulfjdtp/70403190767.pdfIn PDF document text
    • http://aaaexpressac.com/userfiles/file/17461292440.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/6cee8105e03c96e0d1ce14e6e400012c/89465361905.pdfIn PDF document text
    • http://highendschmiede.de/highendfiles/file/xosufarimexatodede.pdfIn PDF document text
    • https://jgranit.pl/userfiles/file/74139254004.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/gga5e41vp9b1sg25g5v19eus5t/17950917609.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082594f0b4e4---83410418779.pdfIn PDF document text
    • https://marljivo.hr/userfiles/file/40936741281.pdfIn PDF document text
    • http://kapli74.ru/upload_picture/jefikirojimuluxisivu.pdfIn PDF document text
    • https://parisnordmedical.fr/docs/file/zoxepi.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/64326027487.pdfIn PDF document text
    • http://birnagarcollege.in/userfiles/file/voteloripomu.pdfIn PDF document text
    • http://csptech.net/admin/userfiles/file/27451570746.pdfIn PDF document text
    • https://wotfiles.com/ckfinder/userfiles/files/75864784197.pdfIn PDF document text
    • http://rhoptik.cz/klienti/devel/sneznerolby.cz/ckfinder/userfiles/files/71124458170.pdfIn PDF document text
    • https://amatnieks.com/pictures/image/75726658500.pdfIn PDF document text
    • https://jakspravnenapsa.cz/userfiles/file/fonadakupu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=free+printable+counting+worksheets+for+kindergartenPDF 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_off0000bad7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAD7 11296 bytes
SHA-256: 49c095bc85f87bbc983560a8f0088e2ddfe2bb89da5656fe6dff2edc7d540296
font_01_sfnt_off0000d4f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ed02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED02 17000 bytes
SHA-256: eac4b965e73161bc250b5ebec3e17ca843d7ad948f4fd49e55ba1bb4a31229ef