Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5b5e3caba338200…

MALICIOUS

PDF

70.5 KB Created: 2021-09-24 23:11:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: e44b384036be1f1d4a45f5c1f67b4c81 SHA-1: 7736ced83f24219c32da967658b4a906b8027270 SHA-256: f5b5e3caba33820087aea127d4861e3107a7b892fd9f0a49a037d9b0834ed0ba
156 Risk Score

Malware Insights

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

The PDF document was flagged by a machine learning classifier and ClamAV as a phishing trojan. It contains numerous links, many pointing to compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and the overall structure indicate an attempt to lure users to external sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://mizuho-co.net/file/ck/files/80223311186.pdf In PDF document text
    • http://fantasymusic.it/userfiles/files/jazuxinalomabodel.pdfIn PDF document text
    • http://stylowa-pss.pl/userfiles/file/vemodajuvamu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161495667d3f0d---11092829992.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142e3c9c34a9---93918020919.pdfIn PDF document text
    • https://panoramamall.bg/ckeditor/ckfinder/userfiles/files/setonunatijosokelunekup.pdfIn PDF document text
    • http://dges.in/userfiles/file/86694688407.pdfIn PDF document text
    • http://thermocomfort.ca/userfiles/file/rididezilanugamotiwivuju.pdfIn PDF document text
    • https://ubitanduk.com/contents/files/newejipipuzurabibunaw.pdfIn PDF document text
    • http://www.startservis.sk/novy/ckfinder/userfiles/files/sulizuzubamobuk.pdfIn PDF document text
    • http://gzcaifeilai.com/ckfinder/userfiles/files/202109230401483233.pdfIn PDF document text
    • http://indemo.pl/Image/files/19353301313.pdfIn PDF document text
    • http://xn--12cbg9dihj7egda2g6a7dceb1d2cp4nvgf4f.com/datas/files/kediwilafaju.pdfIn PDF document text
    • http://jessie.vn/images/ckeditor/files/86272510806.pdfIn PDF document text
    • http://masan315.net/board/imagefile/file/67214803360.pdfIn PDF document text
    • https://digitaldaya.com/imagenes/file/37960481987.pdfIn PDF document text
    • https://moolans.com/uploads/files/kenisejixawivoxudorixi.pdfIn PDF document text
    • https://biodent.ro/m4fm_files/m4news/ck-uploads-files/59764004174.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614af998be425---60549272376.pdfIn PDF document text
    • http://arc-en-cielproduce.com/ckfinder/userfiles/files/85677989426.pdfIn PDF document text
    • https://xn--fct8ml6mwue.tw/uploads/files/86042317072.pdfIn PDF document text
    • http://brette-animation.com/userfiles/file/88964472209.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=diggy%27s+adventure+mod+apk+latest+versionPDF 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_off0000b0a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0A2 15448 bytes
SHA-256: ab8426d25d6afe0436f8d6017114b9276470341062177b425e6ec197555ee601
font_01_sfnt_off0000d82b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD82B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f042.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF042 11140 bytes
SHA-256: e1de7e28a412ad9ea89ec86f46472d837801224844e35b8dfa014285e77bd505