Malicious PDF — malware analysis report

Static analysis result for SHA-256 bae568f84d1c183d…

MALICIOUS

PDF

82.1 KB Created: 2021-09-01 00:54:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8f5cf2e81049c99e46f91e71f16dd841 SHA-1: 2b0213f8574f67b6cc0a6cea3c94e50fe2723659 SHA-256: bae568f84d1c183dcbc404c40845e4c69ba2b81c3387c093784e3cbf191c7f72
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which point to compromised websites or disposable hosting, indicating a phishing or link-farming attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malware. The presence of multiple external URIs and a link farm heuristic supports the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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 https://www.uflo.edu.ar/ckfinder/archivos/documentos/98591104420.pdf In PDF document text
    • http://constantcontinuity.com/membership/data//files/24548080642.pdfIn PDF document text
    • http://parcfamilyreunion.com/clients/b/b3/b3ae52aef0329bb57e848b27182677c8/File/78433464637.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160715a9aaa412---borituvopufapoxuvovobe.pdfIn PDF document text
    • http://global-leasing-management.com/uf/file/pufufanalewujeliwu.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/9dce493803f333c1c2130f89ccfcbf54/32463680728.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3e7e017c13---40642145430.pdfIn PDF document text
    • https://manuscripthandler.com/userfiles/file/26500241204.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f541fdecfe---15540173004.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/16086095305c2e---tebolukiro.pdfIn PDF document text
    • https://myupfield.link/wp-content/plugins/super-forms/uploads/php/files/ta604ebpvfd6376ja854lbcbca/bifadulisorolajepixibusi.pdfIn PDF document text
    • http://akademia-jedenastka.pl/zdjecia/fck/file/fonumuvitomomodafusato.pdfIn PDF document text
    • https://www.bussmann-tiefbau.de/ckfinder/userfiles/files/33492807768.pdfIn PDF document text
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/9bm3gv2l0sl10df76a71c8gcj3/tazemizusiwuwiwozep.pdfIn PDF document text
    • http://h-n-s.net/userfiles/file/tafifupen.pdfIn PDF document text
    • https://aglogistics-bo.net/userfiles/file/36299704017.pdfIn PDF document text
    • https://oykufestivali.com/ckfinder/userfiles/files/wimiwimeretudinepup.pdfIn PDF document text
    • http://geologocarmignani.com/userfiles/files/nolarowaleluwubuso.pdfIn PDF document text
    • http://mtsskzy.com/userfiles/file/turewakogonewebaresimes.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/6664bc61890270ffbd9b6a53d5f0d702/62720896889.pdfIn PDF document text
    • http://otohondamientay.com/upload/files/fuwuputuzezurikuxefomuji.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/ba3f145777eca4d0e90cc33df0d42401/16533659746.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=pdf+convert+to+ppt+filePDF 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_off0000d810.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD810 19140 bytes
SHA-256: acdc27ad12f83a994809795b70d6e309b98c3c170f0858359506d4af9d3018ae
font_01_sfnt_off00010aa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AA8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000122bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122BF 10348 bytes
SHA-256: 44e178ca0c14cf4521d0bf1b3670c2c6c97a38e15416d2a030541b61df2ad9b0

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