Malicious PDF — malware analysis report

Static analysis result for SHA-256 e142e7b26ffcb827…

MALICIOUS

PDF

84.9 KB Created: 2021-07-26 02:43:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: dd33398ff3d36923fbd653e78ab8e5e3 SHA-1: 65d81e82682141df20bb147ed7e7a6e97ffca68d SHA-256: e142e7b26ffcb82737a60f09b22022c83faba9f4a4ab4c3a549120929ca70f4b
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to multiple external URLs, with several hosted on compromised CMS upload directories. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure suggests the PDF itself is the primary lure, relying on external links for payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bea78d1f5e5---25050140658.pdf In PDF document text
    • http://imailbox.nl/images/uploadedimages/file/maraginikinexexumenatani.pdfIn PDF document text
    • http://accomplishtheimpossible.com/userfiles_ati/file/buwiginowuwexitej.pdfIn PDF document text
    • http://amsaneeraus.fi/userfiles/files/54285444774.pdfIn PDF document text
    • https://intrigantka.ru/images/userfiles/file/visosejodabi.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607b9ba0c7277---wavezolajakezo.pdfIn PDF document text
    • https://www.nrlandscapes.co.uk/wp-content/plugins/super-forms/uploads/php/files/49cada8f0ffa2b942b6222d1c4456e31/jenev.pdfIn PDF document text
    • http://billedbutikken.dk/articlefiles/file/7317781359.pdfIn PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c8744e97ad0---bamonake.pdfIn PDF document text
    • https://ski-valloire.com/ckfinder/userfiles/files/woxozamajimegazak.pdfIn PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/5fd53816c33b122ff9c122b17a8593ad/zurozu.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/cecfb41521f2b7b5500fd0cd313b821a/galenurovepufelopuza.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bf36f98b29---38620966295.pdfIn PDF document text
    • http://niezapominajkowo.eu/userfiles/file/faxomupijabal.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7b9189102f---22304668651.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608e3cac61778---sewimesa.pdfIn PDF document text
    • http://111-orte.de/testarea/cwsCMSlight/media/files/nanatuperoxu.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ce94f5fc64---xopipovawuwusujufuwuz.pdfIn PDF document text
    • http://tks-forever.com/upload/2021/06/17/file/56310844083.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/gn9s5mtonjcn4qucpoj8582710/kanekevugegikazus.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/bboltffn1bbpsjvht5b5h7j4s7/sinomudukijunugin.pdfIn PDF document text
    • http://nbpcpentecostalchurch.com/clients/65183/File/sesiderefimis.pdfIn PDF document text
    • https://acgroupenterprise.com/userfiles/file/6547126781.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160cb668b0fdf7---dibifuzegubodor.pdfIn PDF document text
    • http://www.firstpages.eu/app/webroot/files/userfiles/files/8541164668.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=watch+the+grammys+2020+full+show+123moviesPDF 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_off0000e5a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5A8 11504 bytes
SHA-256: 2b21d920d69ccdbc0a1cc5040a8494e6cb31e8ec5b2f70b19116acefdba114de
font_01_sfnt_off0001012d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1012D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001193f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1193F 17132 bytes
SHA-256: eaa8bcbf70fc0f40ca65e022b9d14e76953dee92236e170470eba1e0fa816df0