Malicious PDF — malware analysis report

Static analysis result for SHA-256 0fd5af8ef0a99171…

MALICIOUS

PDF

99.4 KB Created: 2021-06-26 14:52:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: b136432a9b1eb7181457b03105dc3c36 SHA-1: 9f274d4d6ebc335695f9aa492b06ea532fd7ae7e SHA-256: 0fd5af8ef0a9917155343a3830b1b1494be4459c99d3c1653048996f885c8922
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, likely for SEO poisoning, directing users to compromised CMS uploads and disposable hosting sites. The presence of a 'download button' lure further supports a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://cgeminfos.ma/upload/file/3527767893.pdf In PDF document text
    • https://sonarmusic.hu/up_image/file/77112687917.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/be3939561b99613d8d669293460ccfd7/siruzod.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ab9f7d0cd1f---42555582161.pdfIn PDF document text
    • http://energo-winstal.pl/userfiles/file/78959360973.pdfIn PDF document text
    • http://studiotecnicomartani.eu/userfiles/files/gutegowen.pdfIn PDF document text
    • http://forter.vn/hinhanh/file/39929844399.pdfIn PDF document text
    • http://albatrossmrn.com/konadnew/userfiles/file/88667001333.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/mv5dirv105866nml3etdkveoea/60679073904.pdfIn PDF document text
    • http://nw-line.ru/generic/uploaded/59082999469.pdfIn PDF document text
    • https://boucherienabli.com/uploads/FCK_files/file/kutenazizapapevopadazeto.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/c8f002f28cc7877cccd8df18de7cbba4/taxexotiwemiwotaditasi.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/40aa775436ce51f407c9fd909862b478/wuvopenometepitagemoxige.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c89a8ac876d---34825618560.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/u95em5i5gjln6c3m5kaa6mj7u6/87638993032.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a758de5c28b---gowoduroti.pdfIn PDF document text
    • https://oxi-dental.ro/imagini_ws/45469309813.pdfIn PDF document text
    • http://bindashnews.com/userfiles/file/towebijefisa.pdfIn PDF document text
    • http://sghscsjamarai.org/guruhargobind/userfiles/file/zozabevatag.pdfIn PDF document text
    • http://allamericannursing.com/userfiles/file/53742832035.pdfIn PDF document text
    • http://gsmontaggi.it/userfiles/files/12619120966.pdfIn PDF document text
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/1608c47eb3ce6a---69996638896.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16090e77f75c40---kuradonuzopip.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=k7s5a+motherboard+manualPDF 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_off00011e58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E58 18608 bytes
SHA-256: c0d72b129b83efddd3e6a588cc728053ae375026d33be68ecdd93d063e5408ed
font_01_sfnt_off00014f58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F58 10836 bytes
SHA-256: a0fb3a7f912329c50dd906737a69237f6b10227322e166f8032025002c8ae400
font_02_sfnt_off00016848.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16848 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1