Malicious PDF — malware analysis report

Static analysis result for SHA-256 627faa542941305b…

MALICIOUS

PDF

80.5 KB Created: 2021-09-16 23:14:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: dcb8299cac38cc1115afe3b1b3028b7f SHA-1: 2aa231be3a75bb25f1ca1ebbb3535e34a94387ae SHA-256: 627faa542941305b0fb25a9a3ed82a15764a98ce0a2b906b7d2ff7c2cc4f8c61
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, designed to trick users into downloading further malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the link farm strategy is a common lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 https://ht-cooling-j3t.com/contents/files/zedabefezulixag.pdf In PDF document text
    • http://megatex-plast.ru/pub/file/bunutajasegerorudima.pdfIn PDF document text
    • http://rsst77.ru/upload/files/jebogemokevub.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/2l2mc8ckva4k57li9e6962i026/kipemanopawamig.pdfIn PDF document text
    • http://hissekurban.com/resimler/files/wupatamesexejekemut.pdfIn PDF document text
    • http://ephtour.com/FileData/ckfinder/files/20210917_1E44FB7275C68D07.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/16133616be83c3---fipiwevafej.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/16138aa8d70bf4---94007056187.pdfIn PDF document text
    • https://xn--90ah6akb9e.xn--p1ai/f/file/dujijirabokerikow.pdfIn PDF document text
    • https://asesoriagade.com/app/webroot/files/files/46282258645.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/59618589113.pdfIn PDF document text
    • https://mondoaudio.it/img/uploaded/file/81963506553.pdfIn PDF document text
    • http://bastola.org/userfiles/file/bumodezoforazebi.pdfIn PDF document text
    • http://consoles-a-gagner.com/fckeditor/userfiles/file/vekilum.pdfIn PDF document text
    • https://daulte.com/ckfinder/userfiles/files/9017388487.pdfIn PDF document text
    • https://nutrishop.in/ci/userfiles/files/11773569656.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/16142d761373ea---72959727415.pdfIn PDF document text
    • http://pro-customer.de/userfiles/file/84500376024.pdfIn PDF document text
    • http://newshop.jp/archive/file/wetipipan.pdfIn PDF document text
    • https://chungangroup.com/uploads/files/202109012214279122.pdfIn PDF document text
    • https://sofupingame.net/calisma2/files/uploads/3340484739.pdfIn PDF document text
    • http://patroha.hu/file/nenapemevilu.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d16d4d514d---gajesevobifinanagi.pdfIn PDF document text
    • http://verynailscm.com/user_img/file/bepadamas.pdfIn PDF document text
    • http://topaslt.com/userfiles/file/gejuf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=android+text+recoveryPDF 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_off0000d81e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD81E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f030.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF030 17496 bytes
SHA-256: 575960bada2b398ee3e8f29cb4f98319cd3eeb5d876ed8924b65c4d0cbfce6e0
font_02_sfnt_off00011dc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DC3 10252 bytes
SHA-256: 1090346638e7bbdb5cbf3bca1bf517917a5dbd362ecc2a4eae09732f4ad0bb2b

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