Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3aec8fb1d7d22f6…

MALICIOUS

PDF

74.4 KB Created: 2021-06-23 02:48:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 2df00e77783d0b93fe83505a54b51505 SHA-1: 2faa22dca78c147077a09826952034249aff5f7d SHA-256: f3aec8fb1d7d22f66c199eae354596c17f6219185e9d67e5de8ae241c834b93f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous links to compromised websites and disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/95de28d21d2f7a9bbbfd7b1d19419710/58229599001.pdf In PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/39ctb1isj6tmup9mm0j10fmkho/zadinalefuz.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/b0c5bff613e7ea7f0753ae9bf077f917/zaparidapon.pdfIn PDF document text
    • https://feniks9.ru/ckfinder/userfiles/files/pukatetonidalelopodofosa.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b4b578b9271---36218312612.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/ar2kdv334j6aj3cckfsvjjusf5/sulot.pdfIn PDF document text
    • http://markone-tools.com/upload/files/14686836726.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/argipntapc7r5a8cs072vnk0o4/62872036340.pdfIn PDF document text
    • http://pokewaveanaheim.com/uploads/files/93120650624.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608108774c521---33151453906.pdfIn PDF document text
    • http://art-lan.ru/uploads/assets/file/55893428391.pdfIn PDF document text
    • http://ahdongjiu.com/upload_fck/file/2021-5-12/20210512030612807274.pdfIn PDF document text
    • http://mpu-beratung-brendle.de/userfiles/file/kubaxuparigowagedu.pdfIn PDF document text
    • http://avtokit116.ru/!upload/files/benanakovulusenutekofoxof.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=concise+biology+book+class+9PDF 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://scripts.sil.org/OFLIn 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_off0000d117.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD117 5240 bytes
SHA-256: 0319b8c1381c30f458a164f060fff9bd962e6309276667c8f70e75cee9fc1532
font_01_sfnt_off0000e308.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE308 10652 bytes
SHA-256: 85a734bf4231564b23259c40dfbd3124cbaf1b602120f8f1df5e3dfd99d3f467
font_02_sfnt_off00010786.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10786 16164 bytes
SHA-256: ead7fd593d7f5feef6f283420e9b55f8fa4552f107c64b0063d474dd3355abd8