Malicious PDF — malware analysis report

Static analysis result for SHA-256 9440cdbedc8fd390…

MALICIOUS

PDF

82.9 KB Created: 2021-09-10 11:59:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 04d004c245b50251143f2ceb8d358a4c SHA-1: 6fc424d38ca57711b3e384b2f79cc5e66b5a2ae7 SHA-256: 9440cdbedc8fd390642ae8c0278449d947cf95ceb51000c76fd069ef4b075c49
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and an ML classifier flagged it with high confidence. It contains numerous links pointing to compromised websites, many of which host PDF files within WordPress plugin upload directories. This suggests a phishing or malware distribution campaign leveraging compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16131c9307d7ee---94996733594.pdf In PDF document text
    • https://www.paseppe.gr/ckfinder/userfiles/files/gakikilovujef.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/8dc50d6de3f09ba9dea96a27acbd3069/wuraronivewosuzufedok.pdfIn PDF document text
    • https://10s317.com/uploads/files/202109062112035184.pdfIn PDF document text
    • http://peoplefineart.com/assets/202109/files/20210902001701829211.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16132fa84cab20---vunimomojiwidofogovivevad.pdfIn PDF document text
    • http://purepassion.pl/userfiles/file/nejeregagojelurezax.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/16138950f21e69---36021675904.pdfIn PDF document text
    • http://cerezolorente.com/files/cerezolorente/_repo/file/fejipuwitafipogejo.pdfIn PDF document text
    • http://borisovhlebprom.by/var/upload/file/gakijarudimigilasat.pdfIn PDF document text
    • http://xn--82ca1bkibi6eufn5bh1b7i3e.com/UserFiles/File/56532729620.pdfIn PDF document text
    • http://suamanhinhlcd.net/userfiles/file/95428418554.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/rr0psafhs2ji218ha338f4foei/selazebitevejeweber.pdfIn PDF document text
    • https://feng-shuiworld.com/userfiles/file/wegutatokujotuke.pdfIn PDF document text
    • http://szermgrt.hu/uploads/ckfinder/userfiles/files/ranajofurufukarobawagot.pdfIn PDF document text
    • http://www.valaisconsulting.ch/file/93425248634.pdfIn PDF document text
    • http://davidhammerstein.org/userfiles/file/zilikasemefetajitiwirak.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613282c9ec4fe---33553103379.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613615f61540a---48183740890.pdfIn PDF document text
    • https://locktactyuma.com/ckfinder/userfiles/files/kelewunoluw.pdfIn PDF document text
    • http://tehla.eu/userfiles/file/nupaxipugijo.pdfIn PDF document text
    • http://ghettaetamionarchitetti.it/userfiles/files/fidosipugewaf.pdfIn PDF document text
    • https://ducthai.vn/userfiles/file/78996893302.pdfIn PDF document text
    • http://nhanvietgroup.com/demo/xay-dung-tnx/upload/files/19164529315.pdfIn PDF document text
    • http://goldenmallbiotech.com/upload/files/suxafuxu.pdfIn PDF document text
    • https://dialogueinpraxis.net/files/docs/lanurexe.pdfIn PDF document text
    • https://wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/56579759228.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=fifty+shades+of+grey+movie+streamingPDF 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_off0000dc8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC8C 10912 bytes
SHA-256: c7ef035f79813f1bb97c6f3f77d303956d34ee342abf023f4ea19e18306a7002
font_01_sfnt_off0000f576.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF576 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010d88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D88 18392 bytes
SHA-256: a3f47604c802860f71d2cd1ff4c405b85ec01575f33249327c46e582ac2eb37e