Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba6b59a3d882753f…

MALICIOUS

PDF

85.3 KB Created: 2021-08-24 17:52:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6c886029ba09a436388cc813903b4528 SHA-1: 7a18f8bcf1a529f62d94ea60045cecb6d99d390f SHA-256: ba6b59a3d882753fe3f3f6678bdccd3b83f586bf6f7966cb49b26aff5485961f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it is likely a phishing or malware distribution lure. The file contains numerous external URIs and links to potentially compromised CMS upload storage, suggesting it functions as a link farm. The presence of embedded URLs and the nature of the heuristics point towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://philabc.ru/uplcv?utm_term=nscp+2015+free+download
    • https://chetanaus.org/bheru/uploadfiles/file/xozitezu.pdf
    • http://www.ville-dammarie.com/ckfinder/userfiles/files/46074510449.pdf
    • http://torgoborud.org/images/file/kowanat.pdf
    • http://handbook.hu/upload/page/file/2333458740.pdf
    • http://branonperformance.com/ckfinder/userfiles/files/rafulaxapego.pdf
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/fmv7gebtnaaq04o8jf0iv5k63q/86354942678.pdf
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a2f12baa674---megoka.pdf
    • https://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/b35e9d3f02e3471efe3778dea97c909d/78860948228.pdf
    • https://laserbeautymachine.net/d/files/8950863949.pdf
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/8ec7143c271e667e3c24b4c3d11d84b3/toforezusuterumedebo.pdf
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/9fe7f2702c10d12961db96eebc608748/33680107182.pdf
    • https://bohemiamaestro.com/webpagebuilder/ckfinder/userfiles/files/18577105967.pdf
    • https://protechlighting.com/wp-content/plugins/super-forms/uploads/php/files/462caedd8b945dc81e5fb6604cf33f13/sinovaw.pdf
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/ecf5de7875e1414853e5e384c6ba9395/78473730230.pdf
    • http://grupopiscis.com/upload/files/gusepu.pdf
    • http://metalzilembo.it/userfiles/files/43188228987.pdf
    • https://delaneyllc.com/ckfinder/userfiles/files/pimuda.pdf
    • http://korea-seals.com/ckfinder/userfiles/files/pujesekakaxagilax.pdf
    • http://sjhrz.com/images/upload/File/57320993281.pdf
    • http://ecogestval.com/userfiles/file/49571642295.pdf
    • http://delannahotel.com/user_img/file/75418383495.pdf
    • http://shinies.ru/img/lib/file/93610205752.pdf
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607be41755da9---lalonumimafigaf.pdf
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/06f8c9089d413fd3ad59f89cca2bd61a/getakukatom.pdf
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f8bda31ac0---vusototumajusazo.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_off0000e6f9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE6F9 16792 bytes
font_01_sfnt_off0000ff10.bin
d27d30718c396f0dcf78d114e501a0e4b57f8fb1f84d8686c3ba65c13bb55e60
pdf-font-stream PDF embedded font (sfnt) at offset 0xFF10 10912 bytes
font_02_sfnt_off000118aa.bin
b607d559d8294c74fee3a033f38c96c74f84b84984ef388f9cbc66204f9bf391
pdf-font-stream PDF embedded font (sfnt) at offset 0x118AA 17608 bytes