Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a444ff330f88155…

MALICIOUS

PDF

161.9 KB Created: 2021-06-26 08:14:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9b522ea12593914e0d30f39b88875d5f SHA-1: 83818a6224b40b8c9e8e4f5a30aa8855d305907d SHA-256: 7a444ff330f88155c123c6511b608e254b5ff150718fed2268e2bafa9b72559a
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress upload storage and disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs, while numerous, are the primary indicators of compromise, directing users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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 http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bd097bc3b14---46068839889.pdf
    • http://brenno-tojestto.pl/userfiles/file/76765900191.pdf
    • http://mdbim.pl/ubezpiecz/obrazy/file/zupub.pdf
    • http://henri-ruch.ch/doc_pub/file/godibati.pdf
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/tnpfsar62ruc8hboo2v5acer8s/saruvimixitebiwedotivaw.pdf
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6a31f8474c---67325602422.pdf
    • http://mackielaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sotasegizen.pdf
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160987c019865c---69833333517.pdf
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/0mjl56qb0kamhje1i4ms62pm3d/tadugadevinepuvuzamobulu.pdf
    • http://galsabino.it/userfiles/files/wusalibamijeguvun.pdf
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/2137ej1qioih0g80vhn0pdmkr3/31215948844.pdf
    • http://nessium.fr/userfiles/file/pegutivokazapefidaso.pdf
    • http://baaningdoi.com/file_media/file_image/file/7817112472.pdf
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/160739a4f214ce---66929901003.pdf
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608f8b5e475c6---nimewokamefotujasibor.pdf
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/a83592e89438e36a16052b16958f32e3/wimapoxurumimogo.pdf
    • https://boucherienabli.com/uploads/FCK_files/file/tasenotoge.pdf
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/9a2af0ada33f12efda2a570c3d333999/57651667541.pdf
    • http://apsons.eu/files/file/sazamemidoxaruzejasizalut.pdf
    • http://ciaooo.ru/uploades/userfiles/file/6927035341.pdf
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/hm0qmq2rdni76inrpdnig6lh7l5ncdia/rinemikijuwoni.pdf
    • https://edmaker.site/wp-content/plugins/super-forms/uploads/php/files/4c2ad2bc4553aaf0fb6cf3412af325b3/84820072856.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=the+medians+of+a+triangle+cut+each+other+in+the+ratio
    • 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_off000214d5.bin
93ee10529404c803b4d59bca5ae0579984e5586be60d01ff74e690fcaaa49e23
pdf-font-stream PDF embedded font (sfnt) at offset 0x214D5 19168 bytes
font_01_sfnt_off000247a4.bin
84d224dd91c1f7b5ba5439f9ef0935cf349a28fe47c25b6fc140c1e92f3353a6
pdf-font-stream PDF embedded font (sfnt) at offset 0x247A4 10984 bytes
font_02_sfnt_off000260c5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x260C5 16792 bytes