Malicious PDF — malware analysis report

Static analysis result for SHA-256 53198093c0779da8…

MALICIOUS

PDF

97.0 KB Created: 2021-08-01 02:02:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: d2dd6a8a55de0268ef5a14d991f368ea SHA-1: 39410c206a87e2a192f3542a5f9a8d7688d7794f SHA-256: 53198093c0779da86c399d5b589fb1a90d9365e2d14f105a78dc8554bf0a0432
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. It contains numerous external links, many pointing to compromised WordPress sites, suggesting a link farm designed to distribute malware. The presence of a 'download button' heuristic further supports the idea that the document is a lure to trick users into downloading a malicious payload. The embedded URLs and the nature of the heuristics strongly suggest this is a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9726

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://inwebjor.ru/uplcv?utm_term=how+to+draw+bts+easy+step+by+step PDF link annotation
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/082e2e7a61fd7661479792e4e4ce75f4/7179812572.pdfIn PDF document text
    • http://aps-mes.com/files/file/33677039077.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609aa289c79f2---xumufokumowumuzavum.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e9b0e53137---rajusejezuwusodumoditu.pdfIn PDF document text
    • https://panegovernance.com/ourprojects/chowki/UserFiles/file/getine.pdfIn PDF document text
    • https://etonbio.com/newsLetters/images/file/nekukemumowibuxabaru.pdfIn PDF document text
    • http://americasbestwingsbeltsville.com/uploads/files/9991291945.pdfIn PDF document text
    • https://diphong.com/uploads/bujiziselaw.pdfIn PDF document text
    • https://audit-advisers.com/userfiles/file/zamilut.pdfIn PDF document text
    • https://ajitcoatings.com/uploads/jimake.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a7e0cc215b7---nofomivafajolejav.pdfIn PDF document text
    • http://pro-elec.ru/ckfinder/userfiles/files/pajemirijugarewuvijaja.pdfIn PDF document text
    • https://dancleland.com/img/upload/file/45414439926.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/c1eb1e3014e4262b531f34d839898f9a/68726457034.pdfIn PDF document text
    • http://gtlmarinefuel.com/userfiles/file/17037073624.pdfIn PDF document text
    • http://wmc21.com/ckupload/files/9393565291.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/53568343308.pdfIn PDF document text
    • http://proxkimya.com/resimler/files/15787319117.pdfIn PDF document text
    • https://vasantviharproperties.com/userfiles/file/45015766892.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8b3fd6ade6---87635319047.pdfIn PDF document text
    • http://www.lnk-creation.fr/upload/file/3428629747.pdfIn PDF document text
    • http://prosquash.by/data/90779654469.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/dhg73812spvacdcidtopnevj0e/bekerizikorubovew.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5f28ec95b3---vofafefowewerovolezape.pdfIn PDF document text
    • http://blueyee.com/upload/file/272016189364.pdfIn PDF document text
    • http://s292376414.onlinehome.fr/datas/imgmail/file/detaxinofired.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010444.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10444 16092 bytes
SHA-256: 9d5144547e0b729630886a3ad3ce48e7da84b0115899dd9c2390406af6f0fecd
font_01_sfnt_off00011989.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11989 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000131a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131A0 10476 bytes
SHA-256: d2b16374094d4b5acde75873f4f9acdd1ffe39b41476aecb9acc19ccad60f378
font_03_sfnt_off00014960.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14960 17060 bytes
SHA-256: 25d79f5e308927a7990c65bffb8cbe6fa417f7aad4215bc2b111eb56f804504a

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