Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9843eee0172c510…

MALICIOUS

PDF

75.6 KB Created: 2021-09-01 17:02:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 757b2674f1f047265d5f96e1d200d970 SHA-1: 2eb65662e1ee8ba74e182dbd3fcc60fc87409d24 SHA-256: b9843eee0172c5106188c43ca4e6d37e9838660a9a0cb6cb4becc38b8e66e476
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classification and a critical ClamAV detection. It contains a link farm pointing to compromised WordPress upload storage, suggesting an attempt to host malicious files. The presence of a download button lure further supports a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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.
  • 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://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c79fac7ccc0---92446159470.pdf In PDF document text
    • https://communeouchamps.fr/userfiles/file/12297824701.pdfIn PDF document text
    • http://sbnjl.com/userfiles/files/92406853317.pdfIn PDF document text
    • http://ebd.su/UFD/7623/files/18291535592.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612926b3d5eeb---gudopupemiwididanewuvoz.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b756d65c48---manuxugoduratej.pdfIn PDF document text
    • https://edarky.net/data/file/51763300751.pdfIn PDF document text
    • https://profix.fr/ckfinder/userfiles/files/91868368602.pdfIn PDF document text
    • http://norilskgu.ru/userfiles/file/vovaf.pdfIn PDF document text
    • https://diphong.com/uploads/jezevil.pdfIn PDF document text
    • http://amoy-art.com/Upload/file/nawogozonarew.pdfIn PDF document text
    • http://knuhpharm.kr/userfiles/file/20210825051715.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a24ba860a7---7464198110.pdfIn PDF document text
    • https://maturana.cl/upload/file/10565422031.pdfIn PDF document text
    • http://www.look4job.gr/images/_user_na/file/betuvakifonomuj.pdfIn PDF document text
    • http://aivieksteslaivas.lv/userfiles/file/78989264833.pdfIn PDF document text
    • http://ayhancevik.com/images_upload/files/damaxilidedere.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1ae65e74d---bupasina.pdfIn PDF document text
    • https://raiporjai.com/piceditor/file/4077799076.pdfIn PDF document text
    • https://investincarpathians.eu/app/webroot/media/files/xefosopupikexakezogot.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ad9663d8f6c---19075653278.pdfIn PDF document text
    • https://silky.ae/images/bulk_images/files/80234745969.pdfIn PDF document text
    • http://kondicionery-ivanteevka.ru/upload_picture/file/fudaxinonoje.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608eae72e328e---wovositerew.pdfIn PDF document text
    • http://psychologadamczak.pl/userfiles/file/waporubirizagebojokatip.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=glass+ionomer+cement+types+pdfPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c366.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC366 16840 bytes
SHA-256: 4526e3d1c60dbae8b731a2681a879ced9df7763bd95aa05bb2849bf92001043e
font_01_sfnt_off0000eeb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB7 10936 bytes
SHA-256: 0a50026cd463e4fbdca4ec083f22f0756535aaf53d1b406460ba6d619595c82b
font_02_sfnt_off00010813.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10813 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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