Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4f1cf9edc5cf7b3…

MALICIOUS

PDF

81.5 KB Created: 2021-09-05 05:00:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 18ead86c20256f14d8efb9091c92f6be SHA-1: ef9dd57516a65ac44b9efde8d38a996640e4e73b SHA-256: b4f1cf9edc5cf7b3504857e742649cd455acfb8f0ce1f5ac1288ed5ee95199c8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF identified as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many pointing to compromised WordPress sites, indicating a link farm designed to host or redirect to malicious content. The heuristic 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggests this is a common tactic for distributing malware or phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://prana.video/wp-content/plugins/super-forms/uploads/php/files/qc14j7sidh8618t2jscep41205/93802778130.pdf In PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/d8db888be6097c49fd76576fbd3e2755/33475937851.pdfIn PDF document text
    • https://turbooto.vn/upload/files/22295607562.pdfIn PDF document text
    • http://pickup-ws.com/userfiles/files/papejojane.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/86d91871b7a5ddaafc4d09bf22229ff0/wopawodoge.pdfIn PDF document text
    • http://marleenjansen.nl/images/uploadfiles/lutomitidupe.pdfIn PDF document text
    • http://naszymsladem.pl/upload/file/jusarisuduxevabozonano.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/8qe1d1rc0utmnvjbro13at3qf6/59007066330.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097141445923---98168153426.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133f81dd3f8b---79841546504.pdfIn PDF document text
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/3e34f805199cb498e6e760cd4fbe9f1a/846430684.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e944abf2620---88269945606.pdfIn PDF document text
    • http://zoldjogsi.hu/uploads/files/51713719264.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c951288c698---kamejipibulupawupot.pdfIn PDF document text
    • http://alexandersorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/20979159439.pdfIn PDF document text
    • http://chanakol.com/ckfinder/userfiles/files/bulosegozili.pdfIn PDF document text
    • http://cosmickino.ru/sadm_files/tirewoler.pdfIn PDF document text
    • http://tuanayapim.com/rsm/files/nutiguxofejalubidi.pdfIn PDF document text
    • http://architettotoma.it/userfiles/files/borujefivu.pdfIn PDF document text
    • https://www.savininkai.lt/ckfinder/userfiles/files/20607389634.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/068ca6ad59af59d684afc626a72bacb8/zakevowunos.pdfIn PDF document text
    • https://hatinhjobs.com/upload/files/wuzejivido.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/dbaf637bf08cd4330975a67bcf27f73e/gigidiwevitowutexav.pdfIn PDF document text
    • https://gsm.company/ckfinder/userfiles/files/50047400626.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=pleurotus+ostreatus+propiedades+pdfPDF 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_off0000d661.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD661 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE78 10488 bytes
SHA-256: ab4a2d62dc206775be78d6ce4cce20b2db854a97944fa7f8f7ed564839d4cfcf
font_02_sfnt_off00010671.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10671 19012 bytes
SHA-256: 97deb465dc8fdd1e8bddb8709448f7ebb20db6df410b792e9706a71f6d2c23b3