Malicious PDF — malware analysis report

Static analysis result for SHA-256 f49d5c7ef0a0c6a5…

MALICIOUS

PDF

89.0 KB Created: 2021-09-17 18:51:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: dba34c2753594cd04d8e74e3539a8ec0 SHA-1: 5369edc65e7b30908ad4c56fd53726ed7f5ee35d SHA-256: f49d5c7ef0a0c6a5b39effb209d8373b86192c6dfeaad8e298bb7397fe68e46e
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://infrive.ru/uplcv?utm_term=gangstar+vegas+last+mission PDF link annotation
    • https://exihomes.com/userfiles/files/mafusofi.pdfIn PDF document text
    • http://boracayg.com/FileData/ckfinder/files/20210901_BC8A99550080619A.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16132ee0a8a24f---65701231667.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138df105dfb9---visemi.pdfIn PDF document text
    • http://farmandari-sarvestan.ir/images/news/files/99262195222.pdfIn PDF document text
    • http://szsahsh.com/uploads/files/dikixenuvef.pdfIn PDF document text
    • http://lgassociates.in/uploads/25644879943.pdfIn PDF document text
    • http://www.xn----9sbkvfu2aex3d.xn--p1ai/ckfinder/userfiles/files/lelotove.pdfIn PDF document text
    • http://sarkar.ie/userfiles/file/nupure.pdfIn PDF document text
    • https://careerexpo.alljobsinliberia.com/ckfinder/userfiles/files/78654872167.pdfIn PDF document text
    • http://proclima-membranes.ru/userfiles/file/fapebiripedomivenadikuz.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/1aefae698c79d099de2be9d7eb5bb7c8/27581172934.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/16140c5ce827d3---dutobolukej.pdfIn PDF document text
    • https://yifff.se/userfiles/file/papiragomazekakulobina.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/94v4lmlt7c27vs1m5slupae9k3/jigafoxenetulogenewetuwuf.pdfIn PDF document text
    • http://huseyindurmuslar.com/images_upload/files/12727260195.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143c00639646---20639347107.pdfIn PDF document text
    • http://studiotecnicomaglio.it/userfiles/files/xipetakufa.pdfIn PDF document text
    • http://www.groupementpecheduloir.com/ckfinder/userfiles/files/wamapamubabesu.pdfIn PDF document text
    • http://bnblspecialities.com/userfiles/files/95917678931.pdfIn PDF document text
    • http://cristal-in.fr/userfiles/file/64645300404.pdfIn PDF document text
    • https://www.baust.edu.bd/app/webroot/ckfinder/userfiles/files/jilatafajoj.pdfIn PDF document text
    • https://htapigroup3.com/contents/files/pewibuzu.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_off0000f21c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF21C 10556 bytes
SHA-256: 8d935f5063253994bee2dfc6ca8c3247c299776a6e8b7f96bd812ba13a5d9574
font_01_sfnt_off00010a3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A3E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012250.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12250 19572 bytes
SHA-256: 0db9bef2526bad7641559a58dc4286074321fe7f71471230909285958834ef74

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