Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff73d02dd2d8683e…

MALICIOUS

PDF

71.2 KB Created: 2021-09-26 07:01:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 89f36feb4920e2cae6e9cbcf3cbe5d2a SHA-1: 64d7ca91a4205857ecdfb5af45fc78d9b1a38b51 SHA-256: ff73d02dd2d8683ea2ade8d8a9c47f0f5465bd1249c91a24fcb0cc632e1eece2
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. It contains numerous embedded URLs, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm or phishing lure. The 'SE_QR_LURE' heuristic indicates the document may instruct users to scan a QR code, a common tactic for redirecting to malicious sites. No scripts were extracted, but the overall structure and URL distribution strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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+scan+qr+code+on+photo+on+iphone PDF link annotation
    • http://bimbrlata.cz/UserFiles/File/56666164881.pdfIn PDF document text
    • http://www.espaciocultivarte.com/ckfinder/userfiles/files/57729845843.pdfIn PDF document text
    • http://harringtonandlombardi.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/38583557198.pdfIn PDF document text
    • http://www.icareonline.net.au/ckfinder/icare/files/46981272596.pdfIn PDF document text
    • https://onlineadda.organicemall.com/ckfinder/userfiles/files/femigoviduze.pdfIn PDF document text
    • http://bimbrlata.cz/UserFiles/File/fibedarijowetelarotigu.pdfIn PDF document text
    • http://self119.net/upload/userfiles/2021/09/files/210906040217.pdfIn PDF document text
    • https://kirbas.com/img/uploaded/file/xuzekele.pdfIn PDF document text
    • http://www.mariabeckmann.com/fotos/uploads/files/59659565649.pdfIn PDF document text
    • http://mounceconstruction.com/userfiles/file/zuzotobulopise.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614970f6b81ad---jovikizuwogetamuwi.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1614763c835ec0---xadesukelinezesedumok.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/94787424630.pdfIn PDF document text
    • http://impactpluslearning.com/ckfinder/userfiles/files/mijelekewevoxubipabegudig.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/7e7f07ea0b05b0c454d652c2d8c73347/22702688565.pdfIn PDF document text
    • http://yasaitogo.com/uploads/files/zejusika.pdfIn PDF document text
    • http://doggystylzgrooming.com/admin/photos/file/46234222572.pdfIn PDF document text
    • http://uts.edu.co/portal/app/ckfinder/userfiles/files/53326809549.pdfIn PDF document text
    • http://ricarda-allegra.de/userfiles/file/nujalikuxita.pdfIn PDF document text
    • http://3e-machinery.ru/app/webroot/filesfiles/63516769860.pdfIn PDF document text
    • https://pgp-puh.hr/fck_media/file/85377481354.pdfIn PDF document text
    • http://isisthailand.org/file_media/file_image/file/31317527086.pdfIn PDF document text
    • http://zdrowejaja.com/Upload/file/lirewalekedifufuk.pdfIn PDF document text
    • http://fujiya-la.com/uploads/files/32320942677.pdfIn PDF document text
    • http://ageofwonders.buka.ru/sadm_files/kojivunovuxef.pdfIn PDF document text
    • http://poptheme.cn/uploadfile/files/20210905_081825.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_off0000b26a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB26A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA81 10788 bytes
SHA-256: e4786ab1853755c0b5f28f61318a7c3ed88c25532934ce5dc116a4283a3a3f13
font_02_sfnt_off0000e318.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE318 17188 bytes
SHA-256: b881beafcb56eb30fc04f8b0e9119780869f635be2bd348f47f6cbd3611e4cbb

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