Malicious PDF — malware analysis report

Static analysis result for SHA-256 376de2666239581b…

MALICIOUS

PDF

71.9 KB Created: 2021-09-06 10:32:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: feed056865a76180d7ca6523ada69563 SHA-1: 079bd121df73ecefbd2d7f97590769fdbb0543a6 SHA-256: 376de2666239581b0cdd54795af10e877303d16c3ff0da635bdc25173fb90d42
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://laborke.ru/uplcv?utm_term=androgens+and+anabolic+steroids+pdf PDF link annotation
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16070685c27c37---norofotoku.pdfIn PDF document text
    • https://radmangroup-ye.com/rgfiles/file/gafofekivubit.pdfIn PDF document text
    • https://partroyfuneralhome.com/partroy/assets/file/75394640661.pdfIn PDF document text
    • http://lexus-custom.com/js/upload/files/furiretifekomataximu.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/8dcb8fb62442fa0920488897df5c3c0f/50178885242.pdfIn PDF document text
    • http://business-plan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/noxisowolamabani.pdfIn PDF document text
    • http://assisdrive.pt/userfiles/file/320437723.pdfIn PDF document text
    • http://biznesfishki.ru/files/userfiles/files/50733207099.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/1f85a628d0939c9d5893e62e02c35fe9/puwuwenexemoko.pdfIn PDF document text
    • https://circolodelpistone.ch/userfiles/file/9390168350.pdfIn PDF document text
    • http://olsztyntransportmedyczny.pl/userfiles/file/ragelilixoxizowotojilukes.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16126b51b83818---xoroxed.pdfIn PDF document text
    • http://kythuatviet.vn/uploads/userfiles/file/vibesewixadozalelijigo.pdfIn PDF document text
    • http://www.prodomasa.com/ckfinder/userfiles/files/79556432830.pdfIn PDF document text
    • http://asja-doll.ru/userfiles/file/14582818753.pdfIn PDF document text
    • http://exmar.it/foto_fck/file/jonirujufelanusugi.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/89906523249.pdfIn PDF document text
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/iho6ai8k6l28u0j4gjdr71cju2/gesajopomoxa.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/99601492048.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/fasg4avd2p884gsc7ebco27iff/doresu.pdfIn PDF document text
    • http://huiking.cn/uploads/file/090801006132.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/160719f466fcfd---6501138734.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210704224855.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3974d0126a---fapulaf.pdfIn PDF document text
    • http://aroma--style.net/files/files/bigajufo.pdfIn PDF document text
    • http://wirheiraten.de/images/file/90252844913.pdfIn PDF document text
    • http://goldsunjsc.com/upload/files/wununalefiragag.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_off0000bb1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB1B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d332.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD332 10916 bytes
SHA-256: af0baa8d269661c49611a2aa62d2331400c93a537c355ab17841cdcb99b61929
font_02_sfnt_off0000ec2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC2A 14876 bytes
SHA-256: cafeafa359423ea853298e92acf640bcc09fad7db6546f92dae4493a0bfaaed1

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