Malicious PDF — malware analysis report

Static analysis result for SHA-256 89a3a50ce82c9136…

MALICIOUS

PDF

81.6 KB Created: 2021-09-17 05:41:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: df3e2cebfe61ce65517232ee714b6f60 SHA-1: cb2edaa690ce032ee9a394c1673d13858f4cf323 SHA-256: 89a3a50ce82c9136fe7099032be9de72459b5862c0d5b9ed4bb1f76d57d87d2e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. While no scripts were explicitly extracted, the nature of the embedded links and the 'link farm' heuristics strongly indicate a phishing or redirection attack.

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://infrive.ru/uplcv?utm_term=present+simple+present+continuous+present+perfect+and+present+perfect+continuous+exercises PDF link annotation
    • https://valenciamaids.com/userfiles/files/92455120711.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f15374ffd6---fefenabi.pdfIn PDF document text
    • http://stolizstekla.ru/userfiles/file/4185675990.pdfIn PDF document text
    • http://stroyindustry.com/userfiles/file/71680110228.pdfIn PDF document text
    • http://geostudio.eu/userfiles/files/bosaweposegelujobujujup.pdfIn PDF document text
    • http://sgpeo.pl/users/file/40081308934.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16143bc66c59a8---58687370859.pdfIn PDF document text
    • http://imcborivali.org/userfiles/file/raxavofazasopuvogu.pdfIn PDF document text
    • http://webinaris.training/ckfinder/userfiles/publics/files/mitatutebatorexaziluxoz.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/ba08f7ca8df8a85260321ccbd5ff819f/dawaxowuwemove.pdfIn PDF document text
    • http://onroerendgoedindex.nl/images/uploads/36118206957.pdfIn PDF document text
    • https://at2-turbo-j3t.com/contents/files/budaposuneb.pdfIn PDF document text
    • http://gaudi.tw/upload/file/namolonozarivivijoja.pdfIn PDF document text
    • http://studiotecnicopinto.it/userfiles/files/nimewa.pdfIn PDF document text
    • http://partnerplus30.ru/images/fornews/files/mujelupun.pdfIn PDF document text
    • https://kristinanamaste.eu/files/xiwupogid.pdfIn PDF document text
    • http://alburigiott.it/userfiles/files/78430481471.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612f7ae53ff58---688368334.pdfIn PDF document text
    • https://gaadalagi.com/contents/files/68278476144.pdfIn PDF document text
    • https://laatjehuisweerstralen.nl/upload/file/tuzefimovowonedesiwuzale.pdfIn PDF document text
    • https://ingatlansos.hu/images/userfiles/file/95568012821.pdfIn PDF document text
    • http://szpitalstrzelin.pl/userfiles/files/27526470127.pdfIn PDF document text
    • https://www.pelicanfinancialnetwork.com/ckfinder/userfiles/files/gukelur.pdfIn PDF document text
    • http://studiotecnicoligioni.com/userfiles/files/7660257426.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_off0000d70b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD70B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF1D 18272 bytes
SHA-256: f857e434ea2b36c106f59ebd311e73370af679c644cd29582d9d5420a9352898
font_02_sfnt_off00011e81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E81 10984 bytes
SHA-256: 6a17f9d1a0f5f2ffa4e30f5b4428d9339f5e1f1c366a8ea40bb9703e87bfef40

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