Malicious PDF — malware analysis report

Static analysis result for SHA-256 df81aecf1988ef66…

MALICIOUS

PDF

87.2 KB Created: 2021-09-06 18:25:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 89a7e98f8552cdfbb0743c1a1de7ebf8 SHA-1: 1a9a42351711ef2616215a15315f1313d0b964f7 SHA-256: df81aecf1988ef665ccd91bfb91492c8584e957cf63ef4f4fd8dd48b0add7b53
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains numerous external URLs, many of which point to compromised WordPress sites, suggesting it's part of a link farm designed to redirect users to malicious content. The presence of a 'download button' heuristic further supports the phishing lure attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://drafthe.ru/uplcv?utm_term=ncert+english+literature+book+class+10+pdf+download PDF link annotation
    • https://mbamantra.com/ci/userfiles/files/10450427659.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/cebaca05eeb2fc9de15029792e70cb4d/45422533886.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/160855d4622587---70155396595.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c1aebad743---68195589028.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c9af0bc78c---38561059872.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612d872d757f3---jifaferokuxavexod.pdfIn PDF document text
    • http://www.cpiequipos.com/assets/images/user_files/files/vezogebenadexes.pdfIn PDF document text
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/d6a30fc2d1f7698f330e7220d5339dde/fujufijizomeronoxoram.pdfIn PDF document text
    • http://www.mezmat.ru/ckfinder/userfiles/files/tunuladibinuvorab.pdfIn PDF document text
    • http://poorclarescork.ie/images/faduxusafubegajupozonet.pdfIn PDF document text
    • https://nsck-cykelmotion.dk/userfiles/file/timelamuwuvukela.pdfIn PDF document text
    • http://insei.eu/userfiles/files/80410792.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160afdd27a954d---gufubogatebe.pdfIn PDF document text
    • https://feniks9.ru/ckfinder/userfiles/files/ketamedurowizen.pdfIn PDF document text
    • http://bagiez.com/userfiles/file/xofonisatiwobuwodavun.pdfIn PDF document text
    • https://verlauf-ekb.ru/admin/ckfinder/userfiles/files/6939569711.pdfIn PDF document text
    • http://dichvutheapec.com/upload/FCK/file/gumasabijugajerazekudetol.pdfIn PDF document text
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/cc25ba4ac48d7bda1d6ebf6cc5d59cb4/vituvoritutebavalifonod.pdfIn PDF document text
    • http://exmar.it/foto_fck/file/34274551647.pdfIn PDF document text
    • http://hoya-system.com/uploads/files/202108262110022204.pdfIn PDF document text
    • http://unipsyclinic.com/userfiles/file/20210701184654.pdfIn PDF document text
    • https://afayl.com/userfiles/file/fovawumavetadoziberipapod.pdfIn PDF document text
    • http://myqself.com/upload/files/mulisekenakudododoma.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_off0000ec73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC73 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001048a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1048A 11468 bytes
SHA-256: 72275a068eb5ce76bc84cd154061b152902318a1377a065ec579d5af58a4941f
font_02_sfnt_off00011f3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F3F 18472 bytes
SHA-256: 92d0cf87766f9d27d1a70d832cbd87eb809ec124e9034e327198ae563a842e31

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