Malicious PDF — malware analysis report

Static analysis result for SHA-256 a801af7ff620c1d5…

MALICIOUS

PDF

94.0 KB Created: 2021-09-06 12:49:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 7846e0ce9fb9e5ddaedc030af790cb23 SHA-1: cea2318e4ba5f8b0e469e0ad47e74404c7354cd5 SHA-256: a801af7ff620c1d514e78dc8dd830ee190a7733415fd4a08631db22807579c93
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous embedded links, many pointing to compromised CMS upload storage and disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent. Although no scripts were directly extracted, the nature of the embedded links and the PDF structure align with techniques used to deliver secondary payloads or redirect to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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 http://sahamit.net/userfiles/file/33080223087.pdf In PDF document text
    • http://accomplishtheimpossible.com/userfiles_ati/file/91900310824.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160a9036b2fa8e---38534046201.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160821f69bcd1d---73890355607.pdfIn PDF document text
    • http://retroldn.com/userfiles/file/45347632947.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16080ddfe5c4de---86585448591.pdfIn PDF document text
    • http://freeorden.com/media/file/niwonanafilewujuzerilomet.pdfIn PDF document text
    • https://hr-serdahel.hu/images/file/wujowavutu.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/v3db7ifed6mqvkmm7fipujqve4/lesivokutonerejozapadu.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c0f4829d6a8---taturizozuv.pdfIn PDF document text
    • https://evenimentecastel.ro/wp-content/plugins/super-forms/uploads/php/files/jisoeee7r6i06jsvbb3e6tdf2t/warimefiguxuzovuji.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd2518b500d---90787209956.pdfIn PDF document text
    • https://brothers-music.com/ckfinder/userfiles/files/gixotev.pdfIn PDF document text
    • https://godahoian.com/app/webroot/upload/files/70604955862.pdfIn PDF document text
    • https://aspirans.com/files/file/tawikojopovanezon.pdfIn PDF document text
    • https://searchlink.org/userfiles//file/76918419633.pdfIn PDF document text
    • http://keystoparadise.com/userfiles/files/pewujidagiriroz.pdfIn PDF document text
    • http://storemisr.com/uploads/files/zusosawatoxowuwo.pdfIn PDF document text
    • https://rotterdampools.com/contents//files/92349960578.pdfIn PDF document text
    • https://sporyolu.com/resimler/files/kesulabe.pdfIn PDF document text
    • https://binarbaidtrading.com/public_html/userfiles/file/61803771648.pdfIn PDF document text
    • http://indianspringhomes.net/userfiles/files/lanoturosisipigiwatoke.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/bbier2atgslj3smvqdff3ulrac/jomixux.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=the+corrections+jonathan+franzen+free+pdfPDF 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_off00010b6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B6F 10824 bytes
SHA-256: b37b71745ed0a8dee24f94c9d88c7bb6ee03e5edd9ddcba67f0835a7ed2c2c05
font_01_sfnt_off00012461.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12461 17444 bytes
SHA-256: 250dae071a8899ff85cd451ac65c1133972cbefc54c3683f09a2852630019148
font_02_sfnt_off000151f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x151F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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