Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa9549a7035520c5…

MALICIOUS

PDF

82.2 KB Created: 2021-09-04 02:21:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f51272357e50071234e5d1a4b1517cdd SHA-1: 3c0ea2013fa7ad476ba75ad8f51d8274a40cfdef SHA-256: fa9549a7035520c58fe3737d4f395a519d4526690dca55ee7f1e2fba52e237e3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users to malicious sites. The presence of numerous links pointing to potentially compromised WordPress upload directories and disposable hosting further indicates a malicious intent, likely for phishing or malware distribution. ClamAV detection and ML classification strongly support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://www.ecostroyservis.ru/File/supomorikit.pdf
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/u252q8k4h2hud2nrmc9m84b4ab/wirirililefik.pdf
    • http://designerhouse.ru/upload/files/wemapetuzomejux.pdf
    • http://skupka54.ru/upload/m/revavodomumarekojol.pdf
    • http://chhsclassof70.com/clients/1/1f/1f6d1b94cf555b90b9f410dfa82aea5f/File/94210261857.pdf
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/de679962b59c93dccc106c388c15eaaf/desajifenilosoxipovot.pdf
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdd1062807f---22910451632.pdf
    • http://bi-acaovo.com/upload/files/rasumunodinijebupikik.pdf
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/3ef068b3ec5b96bf52cfe6819b148c3d/wofetefutin.pdf
    • http://plncse.hu/php_data/file/xixikewax.pdf
    • http://digivideos.net/ckfinder/userfiles/files/6037915935.pdf
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/fgg6udftkd0n2latiteunbbcto/suxuvubo.pdf
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/5k4oavvk5ji82r1plvqda6g07v/fifita.pdf
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b370cd2a7e3---zivebibanepubodegirazuj.pdf
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfe25f18dc1---putadijud.pdf
    • http://hcm-invoice.vn/hinhanh_fckeditor/file/23073835603.pdf
    • http://geodeslaboratori.eu/userfiles/files/88920210523.pdf
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/160c0851a200e7---gaguxakomuraximaguze.pdf
    • http://boathousebrokerage.com/userfiles/file/budenuzage.pdf
    • http://zs-g.jp/app/webroot/js/ckfinder/userfiles/files/30742727816.pdf
    • http://promocode.lu/userfiles/files/besilebavozawibovifajidiz.pdf
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608b12014c165---jozojuzudojofapuganidakin.pdf
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/161089e00047ca---29974856250.pdf
    • http://dichvuwebsites.com/media/ftp/file/suzexupezeguvadarotuvas.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=zend+framework+tutorial+espa%C3%B1ol+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_off0000d88c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD88C 16792 bytes
font_01_sfnt_off0000f09e.bin
267e4f04ce19d3c1b99988352bf74cfe511b156f8ac74bdd531f16fffd471ca0
pdf-font-stream PDF embedded font (sfnt) at offset 0xF09E 17592 bytes
font_02_sfnt_off00011e98.bin
0da1d1dfb1fbe6319691fb5ae4b2d73ca21d9fc46d6f46ad543dfd3faa073184
pdf-font-stream PDF embedded font (sfnt) at offset 0x11E98 11108 bytes