Malicious PDF — malware analysis report

Static analysis result for SHA-256 41da6b9fd5275dff…

MALICIOUS

PDF

83.9 KB Created: 2021-09-19 23:53:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 9809b9acaa0224a0ed1a4462fb475ef3 SHA-1: 09bc0a42c4732f32becfcdab0b8041d1df4c3b69 SHA-256: 41da6b9fd5275dff1b7eb288f7a0bcd73f95ef00a395b0949ba1c6d3018e2329
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with common PDF-based phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://catamma.ru/uplcv?utm_term=wafa+ludo+voice+chat+room PDF link annotation
    • https://bestcaps99.com/ckfinder/userfiles/files/xeburipisezo.pdfIn PDF document text
    • https://iword.de/userfiles/file/16703181712.pdfIn PDF document text
    • https://www.luthier-auxerre.fr/ckfinder/userfiles/files/nesokinadesiputagoj.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/38e3fb1f19b8f6f17ac5a38f9a190577/53362230238.pdfIn PDF document text
    • http://burragebrothers.org/demo/jolie/beta/userfiles/files/likomena.pdfIn PDF document text
    • http://wajl.net/img/file/202198194237.pdfIn PDF document text
    • http://na3.it/misc/file/41621432686.pdfIn PDF document text
    • https://appchecar.com/ckfinder/userfiles/files/75911453282.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/34de2deb17f9e24d1ef7a3f5591a8f94/13659027989.pdfIn PDF document text
    • https://aparcaderoshaddaichile.cl/uploads/images/files/4044052437.pdfIn PDF document text
    • http://primebrokeragetx.com/ckfinder/userfiles/files/korago.pdfIn PDF document text
    • https://groupekineconcept.com/userfiles/file/34789320662.pdfIn PDF document text
    • http://cl-metalparts.com/d/files/80285926568.pdfIn PDF document text
    • http://eros-arena.com/eros/userfiles/file/71595475031.pdfIn PDF document text
    • https://livre-art.com/ckfinder/userfiles/files/72292416578.pdfIn PDF document text
    • https://www.grdr.org/paidel/ckfinder/userfiles/files/66524612329.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136202a6c1bd---pekizabiwaxowinabedanujil.pdfIn PDF document text
    • http://pretaporter-pegah.com/userfiles/file/safanunosaredadobewas.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/16145d1af5f620---junibebepima.pdfIn PDF document text
    • https://purefeeling8.com/data/file/jogorerike.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16143cedbb3ad1---57942877161.pdfIn PDF document text
    • https://funcarele.com/ckfinder/userfiles/files/13246584548.pdfIn PDF document text
    • http://kitpaisal.com/mypicture/file/10391459330.pdfIn PDF document text
    • http://brcassociati.com/userfiles/files/magulejupifafinodo.pdfIn PDF document text
    • http://kondicionery-pushkino.ru/upload_picture/file/jawesixukemagifekazopuw.pdfIn PDF document text
    • http://ambulatorioveterinarioilghirlandaio.it/userfiles/files/bexeguxopozituse.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_off0000e2d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2D4 18076 bytes
SHA-256: 3fb90a829cb2396097100838c022b33544859b6082c4bbada8b6b59e50868a94
font_01_sfnt_off00011145.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11145 10628 bytes
SHA-256: b7e92f286d739d8143ad0ce82af7fa9607a65c90461ec144ddc0b5c14a548e3a
font_02_sfnt_off0001299a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1299A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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