Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d6b8637e520cae6…

MALICIOUS

PDF

94.5 KB Created: 2021-09-07 14:29:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: bc8c51b8cf1b45775613977f871eaed6 SHA-1: fac1e62c69a3608c441b48a957cc2efff8fadce4 SHA-256: 4d6b8637e520cae6d7d158de56b5b75bbefac99ff35109f6d8a39e900b5fbe2b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many hosted on disposable domains or compromised CMS upload directories, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are consistent with a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9890

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://ketchas.ru/uplcv?utm_term=formative+assessment+meaning+pdf PDF link annotation
    • http://permianhighschool1970.com/clients/e/ef/efee9fcbc667252fc4b649c8163d3733/File/81828197198.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/7g6hbf4itrhkrhblam1256c5jq/turabufitujabunotek.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e28397d1ddd---xezevedubufojetijipo.pdfIn PDF document text
    • http://we-women.de/default/files/uploads/file/94917261771.pdfIn PDF document text
    • http://metallpress.ru/files/65781615141.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160afb15eddf91---fuwetusavivobuf.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/0d2c7e34d8f4712a9af6f0d5fc9eaf5d/91128617406.pdfIn PDF document text
    • http://tksvolga.ru/userfiles/file/tupokuv.pdfIn PDF document text
    • http://xn----7sbezcba9a5aggb3j.xn--p1ai/ckfinder/userfiles/files/bujezapuje.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608354c2a328f---dotojonupujufomozofemuza.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/18190208240.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b89660191e8---buzesazi.pdfIn PDF document text
    • http://b-solutions.net/userfiles/file/30268228317.pdfIn PDF document text
    • https://quimicasorocolor.com.ve/ckfinder/userfiles/files/taxajalavosamipudanabak.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c8f757bbe6e---gilolinogesifexobuwo.pdfIn PDF document text
    • http://www.offshoreyachts.net/web_upload/editor/files/39044367020.pdfIn PDF document text
    • http://poltinka.ru/userfiles/file/9854160386.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/1cb4f73ef7777cde2450be3640cb711b/5388693727.pdfIn PDF document text
    • http://casadiriposomarsala.it/userfiles/files/ferafanegenofuxoworol.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ab718d49363---93837304468.pdfIn PDF document text
    • http://leebyunghun.kr/new/upload/board/files/xapun.pdfIn PDF document text
    • https://ikitellirezistans.com/upload/files/23306194652.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/16094deeaba0c3---vumunagiwukuzibowotexaw.pdfIn PDF document text
    • http://jucal.es/images/file/ludujudumibudalekipuxof.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d3763e0dcd---zavaxuwewukukosinibeg.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dfa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFA1 1680 bytes
SHA-256: 6c08887b596ecb472c5a0482df8c2f828d83fc5b5d16111ed0caa1fced1b35dc
font_01_sfnt_off0000e799.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE799 23876 bytes
SHA-256: 85bc2431c3795e499520886ae6d5cc3cbadfb9c3382250e15cc75ad93b3f25af
font_02_sfnt_off000122dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122DC 16508 bytes
SHA-256: 5a4369e34c1374d67d929ee4c4d3e6a350d1f6597234a940cdb7ae8dc5d6b2d5
font_03_sfnt_off000139e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_04_sfnt_off000151f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x151F9 10836 bytes
SHA-256: cb03d36e564edd323b9fdfd3e40a285b70d272be5d30f6e7af1b5f8377ffd15a

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