Malicious PDF — malware analysis report

Static analysis result for SHA-256 56953b831bb4a297…

MALICIOUS

PDF

100.7 KB Created: 2021-09-18 01:54:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5d59c475a8f1993d94335b0066eb7dd2 SHA-1: 23364920618fa2559d03956a972c481a43fede03 SHA-256: 56953b831bb4a297a9551b219015611df1340ab1e9b4b769571e81174d8066c2
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are consistent with a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://queure.ru/uplcv?utm_term=brave+new+world+pdf+full+book PDF link annotation
    • http://electronicaindex.nl/images/uploads/fudumomiwanituw.pdfIn PDF document text
    • http://archetipoingegneria.it/userfiles/files/gimavex.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/cf74b0ac12117a52e3715318bcaa9be5/pawer.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/f6bb1d0d58b21d56cb95e38d6ff47305/ruratavogoku.pdfIn PDF document text
    • https://digireg.nu/upload/36947385547.pdfIn PDF document text
    • http://gamebonda.com/ckupload/files/35637374037.pdfIn PDF document text
    • http://radiosalsa.fr/php/rs/filesupload/file/barararitomonizu.pdfIn PDF document text
    • http://hwayoung.kr/upfile/files/ledumevadugurivabopizize.pdfIn PDF document text
    • http://themadthinker.com/temp/vinney/HTML/userfiles/file/9448544397.pdfIn PDF document text
    • http://gezond-trakteren.nl/kasteel-doornenburg-img/bestandenfile/21921151917.pdfIn PDF document text
    • https://profix.fr/ckfinder/userfiles/files/wixowobebivifuwigoseza.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b56d7208b7---51819031903.pdfIn PDF document text
    • https://urology-andrology.com/userfiles/file/mitabom.pdfIn PDF document text
    • http://murasakijr.com/uploads/files/fivitatigoriduwumaroja.pdfIn PDF document text
    • http://dakmet.pl/upload/42426887329.pdfIn PDF document text
    • http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/zomunepanagitexiwofusado.pdfIn PDF document text
    • http://studiodebiaggi.eu/userfiles/files/68979007024.pdfIn PDF document text
    • https://martan.es/cenavarra_userfiles/files/kawixomodujonizi.pdfIn PDF document text
    • https://rajatotogroup4.com/contents/files/485640712.pdfIn PDF document text
    • https://biomisszio.hu/tmp/kebuj.pdfIn PDF document text
    • https://myclubowners.travelenvogue.com/userfiles/files/vajunaxe.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ed94486db6---64346986856.pdfIn PDF document text
    • 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_off000122c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122C2 19308 bytes
SHA-256: dee1e3f674035092dd6b5acb71d23e4372c4fee0739513a9ac0a31b1c02fca6f
font_01_sfnt_off000154ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x154EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016d06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16D06 10668 bytes
SHA-256: 28ed46fd9f6965cbd69d28eac86d6490ae22c2997be222c409999c1e991210b7