Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6957bdf1b7a9d9d…

MALICIOUS

PDF

82.6 KB Created: 2021-10-10 13:02:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: b19878e94690710b725eeca9a28d170d SHA-1: a8d64f1e67042b5d26fa4b311302a2e7ec572880 SHA-256: c6957bdf1b7a9d9db1de5ad559daf29fd272abba83dd4d7cc1c236e4ec4a2d2b
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to compromised WordPress upload directories, indicating a link farm designed to host or redirect to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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=tree+toad+meaning PDF link annotation
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1614b96cdcb842---26740108315.pdfIn PDF document text
    • http://dotacjedlaoze.pl/userfiles/file/vebefusidepolupesofe.pdfIn PDF document text
    • https://myphambambi.com/webroot/img/files/92563001646.pdfIn PDF document text
    • https://asztromiskolc.hu/ckfinder/userfiles/files/bumilabexoboz.pdfIn PDF document text
    • http://lixupeng.com/uploads/files/1808838457.pdfIn PDF document text
    • http://sakurahoaanhdao.com/webroot/img/files/jizivofibi.pdfIn PDF document text
    • https://vivaldiroberto.com/img/files/mediafiles/file/najawojeluzimipo.pdfIn PDF document text
    • https://pannonfinanz.eu/editor_up/33142270229.pdfIn PDF document text
    • http://sksound.com/userfiles/file/92580692243.pdfIn PDF document text
    • http://habitat3.eu/userfiles/files/kojexowabazidijeja.pdfIn PDF document text
    • https://zooiguana.pl/app/webroot/media/files/susorevogolawaf.pdfIn PDF document text
    • https://escolaalfa.com/userfiles/file/58617450950.pdfIn PDF document text
    • http://luckdidea.com/ckfinder/images_store/files/wanowupagimixok.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/764158b08eca8ab786c3e500c3c5cb02/pijilimujafefeke.pdfIn PDF document text
    • https://pankajplast.com/ckfinder/userfiles/files/42462091831.pdfIn PDF document text
    • https://j26clean.com/upload/files/lisasivogekigevad.pdfIn PDF document text
    • http://domoticasociale.it/immaginiNewsletter/file/90959922946.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614eaf277375c---90316428621.pdfIn PDF document text
    • http://quangcongluc.com/upload/files/33065313131.pdfIn PDF document text
    • https://www.hermanosvalerorecio.com/ckfinder/userfiles/files/69124566156.pdfIn PDF document text
    • http://sunwisechem.com/Uploadfiles/files/8508993697.pdfIn PDF document text
    • http://matsusushionline.com/uploads/files/fafepe.pdfIn PDF document text
    • 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_off0000d846.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD846 10340 bytes
SHA-256: 5e833a54ddf3ab50928c403f66b27cbd5e38aa73a6664635781cf0c60dc9e5ec
font_01_sfnt_off0000ef53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF53 20740 bytes
SHA-256: c6272f5f0808e31ad76b263cf2f405cb6a309f11ba226f84cab61db95f681c25
font_02_sfnt_off00012563.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12563 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1