Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d8349fd3edc57a6…

MALICIOUS

PDF

89.3 KB Created: 2021-06-27 00:24:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 71c190af3f73cab24347c57e2adb4e59 SHA-1: f6bc19cd6ea31a446936ee9d7c21166635f323c3 SHA-256: 9d8349fd3edc57a6ec7492cf77a409d0243feef747c11bcfd2ea2a9ff934472a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected by ClamAV as Pdf.Phishing.Trojan. Heuristic analysis indicates it functions as a link farm, directing users to multiple external URLs hosted on potentially compromised or disposable domains. The presence of embedded URLs and the ML classifier's high confidence score suggest a deliberate attempt to redirect users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

Heuristics 6

  • 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.
  • 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://nomylo.ru/uplcv?utm_term=nosing+in+stairs
    • https://masterjobintl.com/ckfinder/userfiles/files/sorigidoporanufu.pdf
    • http://bensonlandscape.com/editorData/file/58014125880.pdf
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3707b682c5---sowilinufolipuk.pdf
    • http://unsersohn.ch/images/file/pekizefowajilelofuga.pdf
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609801898db4a---35724616441.pdf
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d798cb025fe---45458043053.pdf
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/s8svg49u0vs7rpa55abq081ego/31311415249.pdf
    • https://digireg.cn/upload/nezepazovuxivusexoruwefob.pdf
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16099d867a0bcc---98454374318.pdf
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc00b6985fc---63043347195.pdf
    • https://alllegaltask.com/wp-content/plugins/super-forms/uploads/php/files/d23plcnb20ueatuu3dkqgkt12q/faferu.pdf
    • http://magendans.com/imagefiles/file/29436054865.pdf
    • https://2acontractor.it/images/file/tazojeju.pdf
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c642509cda---36492726296.pdf
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/1b466f92c0c1bb45f3176dcd85ea656b/bobogisuxulaxuju.pdf
    • http://iwilldoit.ru/uploads/files/files/sototemigomakagepufi.pdf
    • http://atenngo.com/admin/sites/site/documents/89648517681.pdf
    • http://coss-wynn-reunion.com/clients/d/db/dbe3622004495b304d8703879a486b7d/File/lugiluzekopivivenumanif.pdf
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b6483c6af3c---15351676424.pdf
    • https://kuepancong.com/contents//files/45008327324.pdf
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/1606f27df2bbe7---jomoku.pdf
    • http://hainescentreasia.com/images/file/sutodipevomafemop.pdf
    • http://agiusfuneraldirectors.com/files/file/61637086843.pdf
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608b761f8de63---voruvovizurevijiwafor.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160879d2db2143---34835655109.pdf
    • http://zoncmswebsitebeheer.nl/files/editor/file/47646319412.pdf
    • http://dreamcatcherltd.com/userfiles/file/58227573012.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fce6.bin
c385a5fc330170d242c9925ad28a9b8ec2506c6c75308e17354760e419c6006e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFCE6 10080 bytes
font_01_sfnt_off0001137f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1137F 16792 bytes
font_02_sfnt_off00012b91.bin
7e423183a205d370cbf15f4a88ed3dbb4f7c7ffb9ed396ad5a8d2949f0fa03b4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12B91 17564 bytes

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