Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd1356a92b11258d…

MALICIOUS

PDF

69.3 KB Created: 2021-09-20 01:37:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0d98d94cc5486912b11b2436af86b2bf SHA-1: 9fdf24e478c4e3f35700b6eeca69c70d962a7d3e SHA-256: cd1356a92b11258d207754781e550521f3874ee29b90bbb32eda0ad78edeb3c8
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://tl-maskinfabrik.dk/userfiles/file/74323090933.pdf In PDF document text
    • http://esen.life/userfiles/file/gedexubesutami.pdfIn PDF document text
    • http://motorlustor.net/userfiles/file/51837228517.pdfIn PDF document text
    • http://dsfly.com/uploads/files/25053426717.pdfIn PDF document text
    • http://www.waetsukai.jp/system/ckfinder/userfiles/files/73226557715.pdfIn PDF document text
    • http://iaestedresden.de/userfiles/file/meseji.pdfIn PDF document text
    • http://women-for-marriage.com/ckfinder/userfiles/files/38716307463.pdfIn PDF document text
    • http://www.tivafa.hu/upload/file/56310442092.pdfIn PDF document text
    • http://slkuang.com/v15/Upload/file/2021919330152149.pdfIn PDF document text
    • https://www.mppoa.cloudlinesystems.com/assets/ckfinder/userfiles/files/70528537806.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/d1432e8e481b892a7009332463fdad6b/poremu.pdfIn PDF document text
    • http://infinivideo.hu/sites/infinivideo/files/9278117099.pdfIn PDF document text
    • http://birizgardenhotel.com/userfiles/file/42692183350.pdfIn PDF document text
    • http://dinobajka.pl/Upload/file/97027271420.pdfIn PDF document text
    • http://autoset66.ru/admin/ckfinder/userfiles/files/mazoxikojoda.pdfIn PDF document text
    • https://divinenine.net/userfiles/file/79573551048.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/1620480179.pdfIn PDF document text
    • http://faradbox.pl/files/file/wumosix.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/h7fooko955pjkmd3femcqg2p7f/ronoxef.pdfIn PDF document text
    • http://ccsctda.com/ckfinder/userfiles/files/20210912_023034.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613df80f30d4d---wivurimoxup.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=iptv+tv+apkPDF link annotation
    • http://perfecturology.cafe24.com/upload/editor/imagefile/79610694214.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_off0000af07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF07 17168 bytes
SHA-256: 70029a63d928363e6c1ee18855d2d203325f7d49e3ffdc2ce9f2429ebe3a4923
font_01_sfnt_off0000db3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB3D 9592 bytes
SHA-256: bb3ee699053b9d21300fa5fd71a7eca68869f563295b5b0a3b86e04a6e8e9920
font_02_sfnt_off0000f025.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF025 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1