Malicious PDF — malware analysis report

Static analysis result for SHA-256 0cd44be1aa9d7eac…

MALICIOUS

PDF

88.2 KB Created: 2021-07-17 06:18:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4a013aec107c4c314bddf27dacda1ec1 SHA-1: 9ef68d8823b8a7a024edc26250cb653850ce000d SHA-256: 0cd44be1aa9d7eacc2d161ba92f499eb26318a31b7546e45e4376b969e9159ac
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised websites, suggesting an attempt to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://nikosdimos.gr/userfiles/file/75658865775.pdf In PDF document text
    • https://dreamscapes.ca/dream_scapes/userfiles/files/merevorudo.pdfIn PDF document text
    • https://elpollopaulino.com/cenavarra_userfiles/files/jutisalibotojonufob.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a75eb567b6d---28368047781.pdfIn PDF document text
    • http://maekuangudomthara.com/ckfinder/userfiles/files/19340188839.pdfIn PDF document text
    • http://icltindia.in/userfiles/file/91268691838.pdfIn PDF document text
    • http://snotlicker.com/clients/10243/File/wuvaki.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/b1e88869bea980a904dbfd9c2b216744/mumigi.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/631c418f8871da63cbe3a7796d2e98a5/xopazor.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b586b3edafd---ramapemoraxi.pdfIn PDF document text
    • http://asude.istanbul/ck_images/files/35454139342.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/ldq92qv6nrdraf2aqd9eelkl85/68210836747.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607f53c81e19d---23452475590.pdfIn PDF document text
    • http://moskvaznaet.ru/upload/files/52042337897.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/hrk44cp1bag568e1b9d1uuq6c2/kaduzurizawi.pdfIn PDF document text
    • http://sugarfree-gelato.com/upload/file/jeridofixodamozaxonu.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/a0435f97a582f2cb51f21b904e93e075/21725558830.pdfIn PDF document text
    • http://lifemartrealestateconnect.com/wp-content/plugins/super-forms/uploads/php/files/19gn1tpg3vb83gemoatfouodg5/94016662371.pdfIn PDF document text
    • http://verduciautodemolizioni.it/userfiles/file/60840604281.pdfIn PDF document text
    • https://cosplay-expo.it/ckfinder/userfiles/files/napelofarikukopavulid.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092e4ea947e3---93099194429.pdfIn PDF document text
    • https://aprenda-atdi.com/uploads/files/jutakuwovuzigilo.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608827e5e80a6---padekupimenujidisuj.pdfIn PDF document text
    • http://belst.by/upload/file/64922032861.pdfIn PDF document text
    • https://etadelloro.it/images/file/86922578352.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=convert+to+lower+version+autocad+onlinePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e5ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5CE 2296 bytes
SHA-256: 0d91b93c30cdb4b9fcc5287ef31e0f6d3b75050094e35c3303e90e7f2c1d387e
font_01_sfnt_off0000efcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFCD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000107e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107E4 10644 bytes
SHA-256: 4a0024c08af3a9bbf0faf74d069db86502392453f9978394764e421e874e7a51
font_03_sfnt_off00012078.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12078 20032 bytes
SHA-256: 5f1d8dba58f9f00e81d76b21ec952e0a25065f427b45330ea1c2fa59eeb6e241