Malicious PDF — malware analysis report

Static analysis result for SHA-256 a607c712600cf888…

MALICIOUS

PDF

81.2 KB Created: 2021-09-16 19:44:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 72a96bf6f118254504abe07ad5441e3f SHA-1: 5f483e229116f3bdf4f3ab08880458e8b4e8741e SHA-256: a607c712600cf88888167ea72934cd07c29be17fcf84b42e4519225d2f2502f6
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged by multiple heuristics and ClamAV as malicious, specifically for phishing and Trojan delivery. It contains a "Click here to download" lure and impersonates Microsoft, directing users to external links hosted on compromised or disposable domains. The document body is heavily obfuscated, preventing a detailed analysis of its specific payload, but the overall pattern suggests it is designed to trick users into downloading and executing malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9933

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=word+premium+apk+2021.
  • 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 http://www.mab-solutions.fr/upload/file/22726639613.pdf In PDF document text
    • http://chuabenhxuongkhop24h.com/images/files/97845793866.pdfIn PDF document text
    • http://tolltisztitas.eu/userfiles/files/60093851729.pdfIn PDF document text
    • https://www.tri-or.fr/tri-or/ckfinder/userfilesfiles/rurenifoxogi.pdfIn PDF document text
    • http://stnicholasway.com/userfiles/file/96573284902.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/3d87ff029bd504aec04d5dc2d496c70a/vosoluba.pdfIn PDF document text
    • https://profix.fr/ckfinder/userfiles/files/gititova.pdfIn PDF document text
    • http://gwardiajuvenia.pl/zdjecia/fck/file/tananedariz.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/bbc9b44d02c7b35cb5ae668b5f2540a5/riwuworalovenavotedumuk.pdfIn PDF document text
    • http://www.ghidmariaj.ro/app/webroot/files/ckfinder/userfiles/files/budebugi.pdfIn PDF document text
    • http://mrybalko.ru/files/xuduwawafizexalad.pdfIn PDF document text
    • http://www.lovebliss.tw/UserFiles/files/rebobon.pdfIn PDF document text
    • https://gretajensen.com/ckfinder/userfiles/files/13341970751.pdfIn PDF document text
    • https://datatalk.ilvzhou.com/upload/files/2021/09/202109081515283108.pdfIn PDF document text
    • http://hasicimosnov.cz/foto/Image/file/27127324155.pdfIn PDF document text
    • http://studiostocchi.eu/userfiles/files/42500238682.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612feb4365499---guzeduse.pdfIn PDF document text
    • http://foto-preiss.at/upload_files/files/dodopopemukalukavezawexox.pdfIn PDF document text
    • http://glovimex.com/uploads/ckfinder/files/26605185988.pdfIn PDF document text
    • https://clinicaabrahaoosta.com.br/ckfinder/userfiles/files/96894711249.pdfIn PDF document text
    • http://spartaksedlec.cz/spartaksedlec/userfiles/file/mezusinezab.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16133b0b8aabbe---89402152802.pdfIn PDF document text
    • https://gmnavarra.es/ckeditor/files/wuzudili.pdfIn PDF document text
    • http://ancheng-medical.com/uploadfile/files/68036271205.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=word+premium+apk+2021PDF 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_off0000cbbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBBE 19620 bytes
SHA-256: 61b05af765d0d449f18df65a8955699bb6b5bcda20a1beb5b50090068f39de8c
font_01_sfnt_off0000fe8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE8F 10616 bytes
SHA-256: f7771ab0a13b685a15cfa68119daad634d330c713bf328a8c2b5543e296f233e
font_02_sfnt_off000116e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00012ef2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EF2 1680 bytes
SHA-256: 6c08887b596ecb472c5a0482df8c2f828d83fc5b5d16111ed0caa1fced1b35dc

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