Malicious PDF — malware analysis report

Static analysis result for SHA-256 54f2fe7c1d05e064…

MALICIOUS

PDF

87.6 KB Created: 2021-08-10 19:51:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 561b62c8c1e1c286a63b444d3503a1d9 SHA-1: d424434d98cc5bb7ea9c33c49dac2709e15c6ea2 SHA-256: 54f2fe7c1d05e06473f7ce4a86e3a58d7ac93ffca068290c9cf2ac087f2ceffa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of external links, many of which point to compromised websites or disposable domains, 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 malware delivery. No scripts were extracted, but the structure and URL patterns are consistent with a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://infrive.ru/uplcv?utm_term=how+to+change+polar+equations+to+rectangular PDF link annotation
    • http://nissanotogovap.com/uploads/images/files/98717410877.pdfIn PDF document text
    • http://sushi-belovo.ru/files/fivisebemaka.pdfIn PDF document text
    • http://sendedianqi.com/upload_fck/file/2021-7-28/20210728193607351119.pdfIn PDF document text
    • https://www.upperhousedev7.com/ckfinder/userfiles/files/90849732306.pdfIn PDF document text
    • http://wearefamily1234.com/clients/3/31/31b46d3307e4516335aa88350909469c/File/67514573119.pdfIn PDF document text
    • http://zeminyerkaplama.com/upload/ckfinder/files/zalazibegidulobix.pdfIn PDF document text
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/b01bb4439b127e66821fca30c968d456/50953966424.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb65f6e09a2---wafitusexi.pdfIn PDF document text
    • https://smgbid.com/ckfinder_userfiles/files/fatefifipazo.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/6c3a64422cfb36d2b989a08141625866/4613664245.pdfIn PDF document text
    • https://angkorphotographyguide.com/userfiles/file/14063792581.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/d39ct4obge20s7m8ph003ij8th/20659688683.pdfIn PDF document text
    • http://orderbestwings.com/uploads/files/sabizazoratoreru.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/wamupotexowu.pdfIn PDF document text
    • http://k-yoga.org/file_upload/spaw_upload/file/20210625101206.pdfIn PDF document text
    • http://vividconcept.in/userfiles/file/wuzaw.pdfIn PDF document text
    • http://barcelonahotel.vn/UpLoadFile/file/75841002354.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16090548b4a050---33876344442.pdfIn PDF document text
    • https://energooptima.hu/upload/File/bufazuwatazob.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160a6d2a1392b4---49947793853.pdfIn PDF document text
    • http://davidhammerstein.org/userfiles/file/nabigilowotibexekopamaxo.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/160e78c82dab9d---52879471924.pdfIn PDF document text
    • http://worldplastsolution.com/ckfinder/userfiles/files/parugizofar.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_off0000f162.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF162 17464 bytes
SHA-256: 4186515979643358fcf0518a3142ab31eac73c21bccd6765e6449317e9259c7c
font_01_sfnt_off00011f49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F49 10976 bytes
SHA-256: 54549f616632850188e012f6cfc03eafba26c72aad005a34628748d00cae364b
font_02_sfnt_off0001386a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1386A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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