Malicious PDF — malware analysis report

Static analysis result for SHA-256 86d4bf44f94e043a…

MALICIOUS

PDF

103.1 KB Created: 2021-07-22 07:06:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 234f8df1e4d185d39254d6e6555d363d SHA-1: 0fadcf3e48bdfb7b95928eed21ad290b14450b9d SHA-256: 86d4bf44f94e043a3f4287010a93edaccb2f9a98c77e5de7cf38bb1c0ee220da
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many of which point to compromised WordPress sites and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or redirection to malicious content. No scripts were extracted, and the document body was unreadable, limiting further analysis of specific payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9856

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://box8websites.com/ckfinder/userfiles/files/kivaxukakebexezikijunot.pdf In PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/7nqq84keovsqjbk8oh7oqilomi/72736848577.pdfIn PDF document text
    • https://mindspacepsytherapy.com/upload/ckfinder_temp/files/20210601205451.pdfIn PDF document text
    • https://boumqueur-edition.com/upload/fckeditor/file/46392204619.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/pelejajafuzuz.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/87eo3npe72tck5u57531dkkp43/jajivanesimamoza.pdfIn PDF document text
    • http://zentrumok.com/userfile/files/wetigetinivolakoxe.pdfIn PDF document text
    • http://feach.ie/images/uploads/file/32122715521.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/scal1pfh1rf00ao8d800ioqjqk/sadimilenupi.pdfIn PDF document text
    • http://globeksa.com/ckfinder/userfiles/files/bemijuladubuzulipinoxiri.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16075862a856b9---zijunig.pdfIn PDF document text
    • http://casier-a-bouteilles.com/file/84983880440.pdfIn PDF document text
    • http://roomyab.ir/basefile/roomyabir/files/livutape.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160dae38391da8---zowejelumebibarojotejon.pdfIn PDF document text
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/b4srb57jmiml9rnqkjpjbaln0u/piwerexibalosesaliku.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/wodazeduvaniduguxosapa.pdfIn PDF document text
    • http://luingpyrex.cz/foto/Image/file/lajosowono.pdfIn PDF document text
    • http://fratellilongoni.com/userfiles/files/38338347451.pdfIn PDF document text
    • http://www.darvidproperty.com/news/file/nabun.pdfIn PDF document text
    • https://acornschoolcharleston.org/wp-content/plugins/super-forms/uploads/php/files/eaf759312b74a26147c32b6199666de7/32973990716.pdfIn PDF document text
    • https://legacyltg.com/wp-content/plugins/super-forms/uploads/php/files/57e0047e157aa9612e03f574113013f2/82606584728.pdfIn PDF document text
    • http://zetrade.cz/userfiles/file/jinurap.pdfIn PDF document text
    • https://parklanehotel.asia/userfiles/file/linonalasilonuxusufuxuku.pdfIn PDF document text
    • http://micronforgacsolo.hu/UserFiles/file/bulabepemese.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6d59fbec34---todudu.pdfIn PDF document text
    • http://dalnoboy.net/data/filestorage/upload/files/31970490081.pdfIn PDF document text
    • http://stark-tools.ru/images/uploaded/zotukugu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=cute+small+baby+girl+imagesPDF 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_off00013013.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13013 10612 bytes
SHA-256: ce42977bdd3a61dc22f6ad7f389fe15c0b83bec6733e9061fdd6a4072f0072a5
font_01_sfnt_off00014864.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14864 17140 bytes
SHA-256: a4cd8632f37ea4b132b0ac9636b3dba50c23c04c17d53f971533f8fa128d18bf
font_02_sfnt_off0001751c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1751C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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