Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcb12fdf9e358fdd…

MALICIOUS

PDF

87.9 KB Created: 2021-07-01 00:52:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e5d6fa98afb6cb7a4af5da6507146126 SHA-1: 772c95b8189f9b7a34a99363c457411e85de6c91 SHA-256: fcb12fdf9e358fdd2d790062b28e815a3b82e29c721dc046e02d0f5b5ac8fb03
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to compromised CMS upload directories or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely involving exploitation of PDF vulnerabilities to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://irlanc.ru/uplcv?utm_term=safe+and+sound+therapy
    • http://tuclubcr.com/campannas/file/podofunagite.pdf
    • http://yuha.be/_files/file/36934916500.pdf
    • http://jshtextile.com/UserFiles/file///nogitegip.pdf
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3aed58363c---50758999803.pdf
    • https://mudrun.com/home/mud/public_html/ckfinder/userfiles/files/57778308235.pdf
    • https://summit-christian-academy.org/scauserfiles/files/notudofalevuwubab.pdf
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/16099af3be0bce---90691320292.pdf
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/o67daks3lt2ae4ujmjl854d601/89678786961.pdf
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/048cc938b47b1cb48d3c4c591aa8b3aa/buxotizedoxabigugexo.pdf
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/16098880c631cb---jonawameweko.pdf
    • http://worldnaturalfood.com/image/upload/File/47692646051.pdf
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/dd05f427885f2beca586e6051bb9c3c6/95420937328.pdf
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/47d974b0ae52c67d6c0ce21ac57c0fb6/lufajawenalinidelamufuno.pdf
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609dca78d6e42---bubonuletu.pdf
    • https://foodphotoshop.com/userfiles/files/31104898910.pdf
    • http://aldara-latinoamerica.com/userfiles/file/tafazusev.pdf
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/p1odiqj0j1tcc820pihun1ue1s/kubofajuxeket.pdf
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a6a8b01641f---dijuvataza.pdf
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16073f1634dfef---92264503947.pdf
    • https://transmar.biz/ckfinder/userfiles/files/figojopamibaparijomos.pdf
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16094898d0fd3c---94363451189.pdf
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/ded3mk3ut30arp8lmpq1jpok8n/86404522298.pdf
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/96b8eeb704ba629ec9c408a09024be0f/52823200551.pdf
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/6fce299ddb86a05513cd93a2613ae6b8/medupijuj.pdf
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/10cbeecdd8e2391f7c92ea646616dc1d/mevidekukerodok.pdf
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160733839be082---sujezumitavokisifuk.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f521.bin
f71e84aa0abf9e9a29e82f6b8527d3dab989420788b75849267634d931ad784f
pdf-font-stream PDF embedded font (sfnt) at offset 0xF521 17048 bytes
font_01_sfnt_off0001218c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1218C 16792 bytes
font_02_sfnt_off000139a3.bin
6ab86af0c6a5fc552d44f92608b148fced0dcc0b8074763646a1951037425f93
pdf-font-stream PDF embedded font (sfnt) at offset 0x139A3 10748 bytes