Malicious PDF — malware analysis report

Static analysis result for SHA-256 51254b9c6c15461c…

MALICIOUS

PDF

80.5 KB Created: 2021-09-21 03:23:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a551ef00cc9306ffa722c5132ff629b7 SHA-1: a664a47a70dadf73bd6ca316fd7cdfb639383e53 SHA-256: 51254b9c6c15461c978d93166f33cb1a7227e367123b8aa976a914272a82ff34
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting a phishing or redirection attempt. While no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://fcksa.com/ckfinder/userfiles/files/87780025832.pdf In PDF document text
    • http://generale-bureautique.fr/gdb/files/file/suzuniwomutu.pdfIn PDF document text
    • http://aaykpn.com/uploads/editor/files/30047996914.pdfIn PDF document text
    • http://ilsungwarehouse.com/userData/ebizro_board/file/9805512354.pdfIn PDF document text
    • http://webs123.com/userfiles/file/40922713490.pdfIn PDF document text
    • http://graylegalservices.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/89358062251.pdfIn PDF document text
    • https://tumujerrusa.com/userfiles/56297480312.pdfIn PDF document text
    • http://ongxoanhdpe.vn/upload/files/jiwegaj.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/161393a78e127d---7664128069.pdfIn PDF document text
    • http://vagyonvedelemszolnok.hu/admin/fck_upload/file/dunanigemowamebot.pdfIn PDF document text
    • http://zoncmswebsitebeheer.nl/files/editor/file/17438308082.pdfIn PDF document text
    • http://pcwenhua.com/uploadimg/file/1631737674206014521.pdfIn PDF document text
    • http://www.como-grup.ro/fisiere/file/dalus.pdfIn PDF document text
    • http://chipublichouse.com/ckfinder/userfiles/files/monupuwisekodupujanadoge.pdfIn PDF document text
    • https://samsungklima.net/upload/ckfinder/files/77448135.pdfIn PDF document text
    • http://datcat.vn/2018/file/28451837921.pdfIn PDF document text
    • http://musicincw.com/fckeditor/userfiles/image/76094899561.pdfIn PDF document text
    • http://pk.mo/userfiles/file/gikibifubabojelozid.pdfIn PDF document text
    • http://cosmik-kinoteatr.ru/sadm_files/10073139389.pdfIn PDF document text
    • http://xn----7sbicwad4afgcgd5aph7d5e.xn--p1ai/ckfinder/userfiles/files/80951730784.pdfIn PDF document text
    • http://soleilboo.com/images/uploads/files/xigunizasuziv.pdfIn PDF document text
    • https://tedesco.pl/userfiles/file/jalizoruxu.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/cd136529e651cc59eb1ca12a32af49e5/bujotawum.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/64sgr3uq6pjfufnorlo98u58m5/80842421485.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=sword+art+online+english+dub+onlinePDF 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_off0000d948.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD948 10928 bytes
SHA-256: a799ca51f99c5776863ebc579201a86ac947b95421684b704028cdbb37b3f0bc
font_01_sfnt_off0000f24f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF24F 16384 bytes
SHA-256: 7ebd2d93f5bb4424c602ca5a88cda2682815738808421c8f4a74a5765fa5ed4d
font_02_sfnt_off00011c6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C6C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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