Malicious PDF — malware analysis report

Static analysis result for SHA-256 bab6352f2a20c003…

MALICIOUS

PDF

68.7 KB Created: 2021-09-11 17:49:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1bae5b8da71d0a7fc0d8bd3a6852033c SHA-1: 161a4858af34064309c09831bc48d58c1d7a4830 SHA-256: bab6352f2a20c0038c1b9e2b9edb14e7111877c39124905ff4c1f508bfe4f996
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to multiple compromised domains and disposable hosting, suggesting an attempt to obscure the final malicious destination. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://ketchas.ru/uplcv?utm_term=my+phone+is+not+getting+texts PDF link annotation
    • http://eko-inwest.eu/upload/file/17719914663.pdfIn PDF document text
    • http://www.dkmodels.net/ckfinder/userfiles/files/fawisedexarejaxolurem.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/d9e427beb0e1d21a9f276d21ed4079a8/zopinizaf.pdfIn PDF document text
    • http://lotusburbank.com/uploads/files/40370226110.pdfIn PDF document text
    • http://chnli.tw/CKEdit/upload/files/musalumev.pdfIn PDF document text
    • http://seoulmenu.com/uploads/files/medozebofugusevigimusa.pdfIn PDF document text
    • http://usagimatur.com/files/others/2287641679.pdfIn PDF document text
    • http://engroupe.ca/aym_image/files/maxigotidipizaj.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ae40483266---25438052989.pdfIn PDF document text
    • http://kirilmazbardak.com/userfiles/file/busepizosewigu.pdfIn PDF document text
    • http://loadcell.vn/Images_upload/files/fanixikorija.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/9ebba1c59d458ad00b44ba68855772c4/82732336866.pdfIn PDF document text
    • https://sunsoftinfoway.net/ckfinder/userfiles/files/posem.pdfIn PDF document text
    • https://tranduongauto.com/app/webroot/files/images/pages/files/gopemawubotad.pdfIn PDF document text
    • http://sahamit.net/userfiles/file/70515990623.pdfIn PDF document text
    • http://studiolegalebisantis.it/userfiles/files/59822342244.pdfIn PDF document text
    • https://abhimaninteriors.com/ckfinder/userfiles/files/susuduwujujomukata.pdfIn PDF document text
    • http://mmbassisiprovince.in/files/js/ckfinder/userfiles/files/dijujawijudujuzamifagak.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/161383af9d175a---46120423542.pdfIn PDF document text
    • https://pharma-tools.pl/galeria/file/42437368397.pdfIn PDF document text
    • https://dispecom.com/cms_dispecom/sgi_userfiles/userfiles/files/mogusedesexuxozubowuxisib.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/46c1c325516f7fefd3c61dd006a25d57/68026417629.pdfIn PDF document text
    • https://hkbca.org/UploadFiles/file/20210910071531107.pdfIn PDF document text
    • http://www.bandungmesin.com/file/33225727519.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_off0000b0f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0F4 14664 bytes
SHA-256: 5b381cf956350566270d4f4d19cdaef43cbd5b7b9ae0962e3101ed9528bff307
font_01_sfnt_off0000d5b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5B7 10432 bytes
SHA-256: 32345e60ae89a070f6d3bd95cb3d40a99511cf1682f20aa1a2aeb312c5a984f6
font_02_sfnt_off0000ed5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED5E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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