Malicious PDF — malware analysis report

Static analysis result for SHA-256 855c8910e349f5cb…

MALICIOUS

PDF

72.9 KB Created: 2021-09-04 14:16:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5d8c93b82e87f3c83e5071cbc0f76960 SHA-1: e29a01e86545c4d5c86034b8157d8c7ecc5a3fc4 SHA-256: 855c8910e349f5cb09bfc8d9e5e7ef004edc986b31568ff3fb2d0c3a6f9b9225
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and a machine learning classifier. It contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting it functions as a link farm to distribute malicious content or phish users. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://catamma.ru/uplcv?utm_term=magnetic+levitation+vehicles+pdf PDF link annotation
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/d0a26022d375ca477d4ce742ad77fdcb/dipejibufiwevurapawaju.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/54338620d9177571e236e15e413447e1/pusozawigirigipijadar.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611a6a0811201---29666761516.pdfIn PDF document text
    • http://www.tomasjelinek.com/img/pub/file/38311978547.pdfIn PDF document text
    • http://ibookingkr.com/FileData/ckfinder/files/20210826_4D5B4330EED6067B.pdfIn PDF document text
    • https://trickapotisk.cz/webpagebuilder/ckfinder/userfiles/files/surulazofazaxutokigufuj.pdfIn PDF document text
    • https://duproject.com/uploadEditor/files/vizogefixexafivoroji.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607b60d089c3d---tijaxizebibiwukolorube.pdfIn PDF document text
    • https://lesfeesdelhetre.fr/upload/files/36359686657.pdfIn PDF document text
    • https://gujaratisamajparis.org/upload/files/27894063492.pdfIn PDF document text
    • http://cisseo.net/userfiles/files/7712126901.pdfIn PDF document text
    • http://khacdautron.com/Images_upload/files/57492031492.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608519b77b4a8---34220939322.pdfIn PDF document text
    • http://bioident.pl/photos_fck/file/82952498454.pdfIn PDF document text
    • http://nocleginaplus.pl/uploads/userfiles/files/tinanorugujetowufo.pdfIn PDF document text
    • http://pusancard.com/userData/board/file/49338569949.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/64586624657.pdfIn PDF document text
    • http://abwingstop.com/uploads/files/61093054409.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/3fb98d53411ceb3e7f1f4847205a1516/bogedijokitisenobanuwo.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/161149f8051501---3548502956.pdfIn PDF document text
    • http://erisalaw-chicago.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/29698455751.pdfIn PDF document text
    • https://newtech-utm.pl/userfiles/file/zozefapitajafeka.pdfIn PDF document text
    • http://castrolmintabolt.hu/images/upload/file/xisozorivebufezom.pdfIn PDF document text
    • https://aashianarealty.com/file/mitulurolewodome.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_off0000baca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBACA 16392 bytes
SHA-256: d0738e4dc870dfffa12434592cd85e86763cdd9871fc532004acd7087e9acb43
font_01_sfnt_off0000e507.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE507 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fd1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD1E 10860 bytes
SHA-256: 445d691ddbfc906c31b7b138075b61751b5eb50385e83578b11a7c4c08eb1037

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