Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a5fc7b6430b236b…

MALICIOUS

PDF

73.1 KB Created: 2021-09-27 09:10:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a3ee74bdbf0d035b289c127c9d2dada1 SHA-1: 6eb75172c3948df675407a94ff48b1b2e418aaaf SHA-256: 6a5fc7b6430b236b9249671a70bebd3cb22897a82635a6df28614dcbddb680d4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ClamAV and an ML classifier. Heuristics indicate it functions as a link farm, directing users to multiple external websites, some of which are hosted on compromised CMS uploads or disposable domains. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the presence of numerous unknown URLs suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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 http://imhyuk.com/imhyukeditor/userfile/file/82696700896.pdf In PDF document text
    • http://pharmorgsyn.com/upload/files/zosalexalabafe.pdfIn PDF document text
    • http://dream-mebel.com/pic/file/pukudejikabexikisux.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16150f126d0228---pawajog.pdfIn PDF document text
    • http://s13cf5ef.alojamientovirtual.com/ropalaboralbarata.com/userfiles/file/temuwos.pdfIn PDF document text
    • https://dispecom.com/cms_dispecom/sgi_userfiles/userfiles/files/41334404581.pdfIn PDF document text
    • http://www.chp.pl/ckfinder/userfiles/files/61251028375.pdfIn PDF document text
    • https://glearningsolutions.com/userfiles/files/vukirosovupodezute.pdfIn PDF document text
    • https://tworaise.com/userfiles/file/gafonepepoxijobiwunoko.pdfIn PDF document text
    • http://cinebuzz.be/uploads/userfiles/files/turaxilixoke.pdfIn PDF document text
    • http://nhatrangpalace.vn/app/webroot/upload/files/82068220881.pdfIn PDF document text
    • http://elturo.ru/img/upload/files/sifufa.pdfIn PDF document text
    • http://piazzademarini3ge.com/userfiles/files/fobife.pdfIn PDF document text
    • https://producedepot.us/userfiles/files/tevarubakolujazomoxanuf.pdfIn PDF document text
    • http://vhz.cz/user-files/86819236538.pdfIn PDF document text
    • https://toscanafantastica.com/userfiles/file/zexebakumasurimatugazoli.pdfIn PDF document text
    • http://solamsys.com/userData/board/file/rosarodisuwurepukeri.pdfIn PDF document text
    • http://fskyok.com/uploadfile/files/9164105471.pdfIn PDF document text
    • http://guojingmall.com/userfiles/file///21784422849.pdfIn PDF document text
    • http://matras-devison.ru/upload/file/ragavifutijixusewejofo.pdfIn PDF document text
    • https://seltec.io/images/uploads/files/13855351428.pdfIn PDF document text
    • https://buddhaart.in/userfiles/file/muvibeju.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161423acc73a84---39286256437.pdfIn PDF document text
    • https://partroyfuneralhome.com/partroy/assets/file/domelimosedenij.pdfIn PDF document text
    • https://zzwgjx.com/d/files/95147781389.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/qgljl51h8kmrhukr568e6qfvgh/53852192504.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=pdfelement+mac+freePDF 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_off0000b56f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB56F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cd81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD81 19500 bytes
SHA-256: b99d7ed24620c444a7949d25829a66553df64c57ca1b6f8004fdf5ced2acf155
font_02_sfnt_off00010022.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10022 10256 bytes
SHA-256: 36cf7f0e1fbe75328623f0986aaa9571a4cf9dd7376ac7c9e195f6a27012d360

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