Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ede66974d226bbf…

MALICIOUS

PDF

82.1 KB Created: 2021-09-18 03:32:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: aca705e00c9e9aaeb84c6130186dcd3c SHA-1: 802e6013b469143aa6fd7c24ae6870ddbfcd2074 SHA-256: 7ede66974d226bbff75c1b81428bdbc15639378ec62646e34ab027aff03152d7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as a malicious PDF by multiple heuristics and an ML classifier. It contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting, suggesting an attempt to redirect users to malicious sites. The presence of embedded JavaScript indicates a potential for further exploitation or payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://synerhu.ru/uplcv?utm_term=clearing+play+store+data
    • http://3qbuy.com/CKEdit/upload/files/xejoxiwepog.pdf
    • https://sadex.pl/fck/file/47720573072.pdf
    • https://peoplesmodelinternational.com/ckfinder/userfiles/files/dejiputi.pdf
    • http://moonlightmontessori.com/upload/files/sodesisivixopomebasigixi.pdf
    • http://srividyaastrology.com/userfiles/file/fukalokexasu.pdf
    • https://palcev.ru/userfiles/file/72178783000.pdf
    • https://shoppingplanet.ro/ckfinder/userfiles/files/17170366502.pdf
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c7bd7ccc90---4884603012.pdf
    • http://warmistore.com/userfiles/file/71003652443.pdf
    • http://unipsyclinic.com/userfiles/file/20210917053115.pdf
    • http://seamcc.com/UserFiles/files/39714310607.pdf
    • http://traiteurluc.com/userfiles/file/91109911539.pdf
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/161395d9aa945d---97213529670.pdf
    • http://dokumsuzgec.com/userfiles/files/kakanemakido.pdf
    • https://seerupit.dk/assens/file/59415968284.pdf
    • http://xnucleus.com/members/member_images/files/55748334384.pdf
    • http://ibsdhc.hpds.work/ecdemo/web/js/ckfinder/files/files/95923490284.pdf
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/c718c0ebd16f81ba89ac8a0fb3d17cdd/57829465388.pdf
    • http://laxycoffee.com/upload/files/wagesofugojuz.pdf
    • https://www.supremecaravans.com.au/application/third_party/ckfinder/userfiles/files/vulibepoxixoguxetaxu.pdf
    • http://3e3i.com/UserFiles/file///83532937306.pdf
    • http://biondiairsystem.it/userfiles/files/38634284513.pdf
    • https://sakesushimn.com/userfiles/files/tidezuloniwi.pdf
    • http://thehedgerowchronicles.com/ckfinder/userfiles/files/fifobeberet.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db66.bin
1a151f8539d29293afa1ec631d11ce5495cbceb4a865b75757c4b1b2eebc4d0e
pdf-font-stream PDF embedded font (sfnt) at offset 0xDB66 10712 bytes
font_01_sfnt_off0000f3ee.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF3EE 16792 bytes
font_02_sfnt_off00010c00.bin
2269c31a547bddc6efbd25bd3141c248ecd3db7b9c808fa365770be1cd484b01
pdf-font-stream PDF embedded font (sfnt) at offset 0x10C00 18408 bytes