Malicious PDF — malware analysis report

Static analysis result for SHA-256 3796665c1af43762…

MALICIOUS

PDF

103.2 KB Created: 2021-09-18 15:57:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d0ef5c8f6c5adb7d9c44ca1a7fdd3484 SHA-1: 81e703c28f4cf50f83568b54c57c3db14889bbee SHA-256: 3796665c1af4376258c7678c899b73de5e8f723c223776f60153fd8b7f4fdd62
156 Risk Score

Malware Insights

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

The PDF document contains a link farm with numerous URLs, several of which point to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The document's structure and URL patterns suggest it is designed to lure users to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://omni-links-europe.com/images/blog/file/zumobelurivugegafefosodox.pdf In PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/422dd50d155ac22f38cf2fd268078c12/80154761975.pdfIn PDF document text
    • http://abnigakgdsg.friendship-match.com/upload/files/fivowi.pdfIn PDF document text
    • http://trevelsi.ru/ckfinder/userfiles/files/29719702113.pdfIn PDF document text
    • http://poltinka.ru/userfiles/file/51843102331.pdfIn PDF document text
    • https://singhaniabrothersltd.com/ckeditor/ckfinder/userfiles/files/12750255015.pdfIn PDF document text
    • http://studioindelicato.com/userfiles/files/mozokupaguxamebuximodaxu.pdfIn PDF document text
    • http://grandviewgroupresort.com/upload/files/18684344273.pdfIn PDF document text
    • http://wish-pharma.com/upload/files/41698140518.pdfIn PDF document text
    • http://balie.overeembv-profielen.nl/upload/files/gusuvopipuzibawimewe.pdfIn PDF document text
    • http://minhtoangalaxyhotel.vn/app/webroot/files/ckfinder/files/67798915679.pdfIn PDF document text
    • https://itracmediav5.com/ckfinder/userfiles/files/94454761774.pdfIn PDF document text
    • https://supermagnum-bg.com/userfiles/file/fumobefetukomore.pdfIn PDF document text
    • http://omgmediatank.com/userfiles/files/93393387240.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16138ebd965b9c---tifevisinakisamitar.pdfIn PDF document text
    • http://dunakeszi.varosom.hu/userfiles/files/mizowupika.pdfIn PDF document text
    • http://toonesk.com/upload/40016503295.pdfIn PDF document text
    • http://samuiluxurytravel.com/Uploads/file/xitiwobevotetu.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/pcnv0lqnocv1eng6o8pampimn0/91953623.pdfIn PDF document text
    • http://e-photo.lv/ckfinder/userfiles/files/zumomagaxapefepesezepum.pdfIn PDF document text
    • http://thekitchendesignstudio.org/uploads/files/12692321589.pdfIn PDF document text
    • https://kccegis.com/upfiles/content/file/20210910065035.pdfIn PDF document text
    • http://dailyliving.nl/ckfinder/userfiles/files/18164472090.pdfIn PDF document text
    • http://ilovechardonnayhills.com/userimages/45271183412.pdfIn PDF document text
    • http://nwatchonline.com/userfiles/file/14029510376.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=san+andreas+infinite+health+cheatPDF 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_off000130a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130A1 10528 bytes
SHA-256: 12fce61ada8d1997ed22930d1122b098f24b6043d79cc728ef9ff9cb0c9949aa
font_01_sfnt_off00014875.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14875 17804 bytes
SHA-256: 51646b280ddca7f5dd575ab02b521e5bfd089002648f981060ce8b86c3c6e4ff
font_02_sfnt_off00017701.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17701 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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