Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8ca9bf8dfe261ef…

MALICIOUS

PDF

88.0 KB Created: 2021-09-18 03:58:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 082de604c6d5913bdea3fa79f71ffd7b SHA-1: 2e2a62e1ef1cf919eae1f105ca15db7b94cd2a5f SHA-256: b8ca9bf8dfe261ef064056fdfd625965b05335451ab17d33885f2c3507a1e1a6
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 CMS upload directories or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or trojan delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://warsztatgdynia.pl/app/webroot/media/files/11894727768.pdf In PDF document text
    • http://keralastatetailorsassociation.com/userfiles/file/2607555987.pdfIn PDF document text
    • http://smenergy.kr/uploaded/file/346539055613c5619e0b33.pdfIn PDF document text
    • http://maturitni-ples.eu/UserFiles/File/xexojiser.pdfIn PDF document text
    • http://er-trans.com/img/produkty/files/48430647514.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136b6554dc01---ferawarabotata.pdfIn PDF document text
    • https://rajaunited.com/contents/files/zowawode.pdfIn PDF document text
    • http://beastyenergy.com/userfiles/file/sujiwusazopi.pdfIn PDF document text
    • http://sysquare.com/UserFiles/files/9333577069.pdfIn PDF document text
    • http://indianspringhomes.net/userfiles/files/zabewuwavelunavotarojanud.pdfIn PDF document text
    • https://educationindiajournal.org/ckfinder/userfiles/files/62686871714.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/ae6230119212872e7580605a9170dec1/konipupam.pdfIn PDF document text
    • https://iasvn.org/Images_upload/files/radonomiworaleribuzov.pdfIn PDF document text
    • http://ngnjl.com/userfiles/files/63540214314.pdfIn PDF document text
    • http://oodow.cn/upload/file/210913174947919081b6uf8ik5mtve.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/161342a1446a32---zipisaxoforib.pdfIn PDF document text
    • https://ijacr.net/assets_admin/ckfinder/core/connector/php/uploads/files/bumegowup.pdfIn PDF document text
    • http://career-id.org/ckfinder/userfiles/files/78146094645.pdfIn PDF document text
    • http://wabasnb.com/files/fckeditor/file/15405493456140022fca78e.pdfIn PDF document text
    • http://partner-support.net/user_data/userfiles/files/wimifaxo.pdfIn PDF document text
    • http://aranysolyomfeszke.hu/editor_up/11972860097.pdfIn PDF document text
    • http://gemaeldeundobjekte.de/uploads/files/mubajituwezilolimojaxez.pdfIn PDF document text
    • http://perilatomsk.ru/ckfinder/userfiles/files/33994980177.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=the+hate+you+give+filmPDF 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_off0000f52d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF52D 10532 bytes
SHA-256: 2c8a5367515f81c50c14dcf4ef9a347e2545a399ec6aa69eaa74eb1eec68a458
font_01_sfnt_off00010d35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D35 17608 bytes
SHA-256: 4e6a935fab1929076ea601e1b363d395ac9d76aeddde90f8c0e93a37d6e815a8
font_02_sfnt_off00013ac3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AC3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1