Malicious PDF — malware analysis report

Static analysis result for SHA-256 0fcd5176cc53329b…

MALICIOUS

PDF

92.5 KB Created: 2021-08-13 10:42:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: db5eebfece2d0ea3376742c1dc3c96ba SHA-1: f052e09262ba3363fc3c130ef9bb17108ee45b21 SHA-256: 0fcd5176cc53329b1efbb33d48b1df2c327df2fe341fa7eb3f2687f0e112b9d9
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as 'Pdf.Phishing.Trojan'. It contains numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm. One URI points to a raw IP address, suggesting a potential attempt to bypass domain reputation checks. Embedded JavaScript streams are also present, which could be used to further obfuscate the malicious intent or execute additional payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://kielcenoca.pl/files/file/55400298565.pdf In PDF document text
    • https://astek-telem.fr/userfiles/file/46980941887.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c513f346677---sewum.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609a39c952cb2---66439347535.pdfIn PDF document text
    • http://chia4kids.ru/ckfinder/userfiles/files/45056649733.pdfIn PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/rv8isjvdjh6e3rjiukgne5q1sp/tinukuledu.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608aca0eb635d---xawiwazafumasavudiz.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/1641221060.pdfIn PDF document text
    • http://127.0.0.1/kardelenemlak/upload/files/rajaxoxijamesukuv.pdfPDF link annotation
    • https://urbanlivin.lu/userfiles/files/94376004127.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16078de2f56954---dubiduvedekenowojotosa.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160939f9909345---66129814388.pdfIn PDF document text
    • http://angelcabrera.com/FCKfiles/file/riminawekafufobawin.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/ukepiu6gsvnjtpincl2aopmg60/92046808103.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/160716e1e30166---vesumegowex.pdfIn PDF document text
    • http://suttonoakfarms.com/clients/880813/File/55167422719.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1608c03d6e3057---54504327006.pdfIn PDF document text
    • https://chameleoncoupons.com/adgprocessing/uploads/files/levabeligetokixozalemu.pdfIn PDF document text
    • http://daiichilogistics.com/uploads/news_file/56765180063.pdfIn PDF document text
    • http://burningspearmarketplace.com/js/ckfinder/userfiles/files/41711697721.pdfIn PDF document text
    • http://gavinlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dakezigigibirexuxafe.pdfIn PDF document text
    • http://boxerdapolenta.com/cmsimple/images/file/83735952333.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=dibujos+dinosaurios+para+colorear+imprimirPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF20 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010737.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10737 10948 bytes
SHA-256: b2e483a94a5d387094a1a93684ce5cc04cb953cdec0d65403a7f27a394e89eb3
font_02_sfnt_off00012043.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12043 16132 bytes
SHA-256: da3599785d691edba6bb1dc804d5dbf9cdb050cf7bdfa967d514dff539c0bfb6
font_03_sfnt_off000135ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135AE 17760 bytes
SHA-256: 88147a3c11906cc3cf1c8cb004f83d6469efe81a0848f8877ae4e454d2bb5cb7

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