Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5fab3c4620f5c9e…

MALICIOUS

PDF

85.9 KB Created: 2021-08-03 09:49:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5bb018487cbca6aa42102b6f04fca39d SHA-1: 53555b669bb0a8b5b860ad9532c810d14e7c08ef SHA-256: f5fab3c4620f5c9e206ca476868d5921c6e04550a201f6eccdff0e0888553b95
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous embedded URLs that point to websites hosted on compromised CMS platforms, likely to lure users into downloading further malicious content or phishing for information. The presence of multiple distinct hosts and the use of 'utm_term' parameters suggest an attempt to obscure the true destination and potentially leverage SEO tactics for distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://webupdate.ca/wp-content/plugins/super-forms/uploads/php/files/bmou6s0ks235b5odoghbeidbtp/76175018436.pdf In PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/3334770306.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/fd44a2bc41aefbb18d6fa4628406d282/14609259114.pdfIn PDF document text
    • http://unseenadventure.com/userfiles/file/94836619484.pdfIn PDF document text
    • https://gulfsupremesa.com/ckfinder/userfiles/files/zizotuxumema.pdfIn PDF document text
    • https://adreshosting.com/calisma2/files/uploads/17483515624.pdfIn PDF document text
    • https://mayurherbal.com/userfiles/file/sejinojunomatalavelabi.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/1659b70bd34efff76aa18f06d49cca2d/pubifomivuwifevaguvunizi.pdfIn PDF document text
    • http://vasvaripalmuzeum.hu/upload/file/28789913140.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/8c79152a9dd649232386a70be6521f5d/38400447946.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/v7dt09t8c7pdc2pparfijcvdd6/96629319746.pdfIn PDF document text
    • https://groupunsur4.com/contents//files/25346475190.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609861981b309---91279427975.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/5ecn89aon0c3s6gs1i1ucjn19j/magubexevupop.pdfIn PDF document text
    • http://bizbecho.com/pa/trainstation/uploads/image/file/jopezabokowogol.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfdeb0d6d2f---xosalikidabexodarawa.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607184a4007e6---73962106565.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160781eb3576b2---rolejarosumawelami.pdfIn PDF document text
    • https://srmhospitalities.com/images/bulk_images/files/divonakudumadadu.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/c5eefe69b0c22ccaee79794435b7afb7/29329292012.pdfIn PDF document text
    • http://giasuthanhdat.vn/Images_upload/files/liwelumafufagorenikiw.pdfIn PDF document text
    • http://amoy-art.com/Upload/file/sivamiruwabotofenozenuke.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/2059ab3541e6005eaf2d29b57e9f1633/dutuzusumobiv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=gta+vice+city+s%C4%B1n%C4%B1rs%C4%B1z+can+hilesiPDF 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_off0000e7a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ffb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFB8 19128 bytes
SHA-256: a138029e7a429d8d295b5446e6df78d6413e0d0b01609fbcb02da4141aae240c
font_02_sfnt_off00012f30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F30 10532 bytes
SHA-256: 9dfdb696ad29f62c59e0bb8a5e016f70959e9d0b6f75794adfa9ecf26ee3cc68

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