Malicious PDF — malware analysis report

Static analysis result for SHA-256 bed1c84bcf1c3c87…

MALICIOUS

PDF

80.3 KB Created: 2021-09-20 09:05:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8dfd9d476cc0fa413f28089844e1aa4d SHA-1: c74486c865056dbd9e2b792d2201fefade069819 SHA-256: bed1c84bcf1c3c87089adb169076f3a4bc4914c731acaabecfe51ecd7bb127f0
164 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to compromised websites and disposable hosting, likely to facilitate the download of a second-stage payload. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://globalmediaminds.com/uploads/files/perisunuponutalapefemufaw.pdf In PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16138fc137d26e---86055214356.pdfIn PDF document text
    • https://branchennachweis.eu/userfiles/file/22240607922.pdfIn PDF document text
    • http://kenshopvn.com/uploads/files/99024922564.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613d42c50f660---88578639581.pdfIn PDF document text
    • http://katyababash.com/images/uploads/file/fawaxizafomor.pdfIn PDF document text
    • http://progettogeometra.it/userfiles/files/leduxesixujo.pdfIn PDF document text
    • https://armature.ir/cache/fck_files/file/jerezigoma.pdfIn PDF document text
    • http://konyanincigkoftecisi.com/userfiles/file/xidozoxepanevep.pdfIn PDF document text
    • https://bandotrading.it/uploads/file/benelepadifuvojidul.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/6a517f375a47245c2a30996121287228/19471418144.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161336693e7919---65984910021.pdfIn PDF document text
    • https://ww150002.linebot.net/upfile/files/20210919184907.pdfIn PDF document text
    • https://madeinstlucia.com/userfiles/files/zijemolaba.pdfIn PDF document text
    • https://snoman.mb.ca/ckfinder/userfiles/files/48130113144.pdfIn PDF document text
    • http://dakdekkersindex.nl/images/uploads/45723826787.pdfIn PDF document text
    • http://fteq.ru/files/file/tiwimoriv.pdfIn PDF document text
    • http://azizavacanze.com/userfiles/files/nenexufegenixeranufabez.pdfIn PDF document text
    • http://lawngo.net/fckfiles/gomajuwitekivomifuw.pdfIn PDF document text
    • https://educationindiajournal.org/ckfinder/userfiles/files/86585083773.pdfIn PDF document text
    • http://hbaoge.com/upload/files/63797789485.pdfIn PDF document text
    • https://h1t-url12shio-turbo.com/contents/files/ziwadafunudefi.pdfIn PDF document text
    • https://evermoral.hk/upload/file/1630905785.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=steve+jobs+by+walter+isaacson+pdf+downloadPDF 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_off0000d0f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e90b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE90B 11224 bytes
SHA-256: d6627bb7550a211a441a5a0c02ea395799db4a40212eae904674380fb30fff06
font_02_sfnt_off00010349.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10349 18480 bytes
SHA-256: 328f2031ca07bf10615c9bf02e2f6d25017cb15b9a8da9001cdafdeda9ef7db4

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