Malicious PDF — malware analysis report

Static analysis result for SHA-256 349ad527c56543bc…

MALICIOUS

PDF

82.1 KB Created: 2021-09-06 11:09:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7f91e31e2d46be68dd0504ca76876cc8 SHA-1: e579774cc4bc3b0658459093783c643f2884cac6 SHA-256: 349ad527c56543bcc4db50249438d0a5ee149102f350a115e52f0a88d4fc5d6c
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 delivering malicious content. It also features a link farm pointing to compromised WordPress upload directories and disposable hosting, suggesting an attempt to obscure the true destination or host multiple lures. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606f96e2696fe---zividugemebesare.pdf
    • https://ventadeterrenosurbanos.com/userfiles/file/13296750393.pdf
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/d3f9d6ce265b5d4777907d8a44b40cbb/17822266386.pdf
    • https://www.nickelmarket.co.za/includes/ckfinder/userfiles/files/32124985642.pdf
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072f3dce2b5a---76528467369.pdf
    • http://medicaldistri.com/ckfinder_files/files/kapogolabuxeva.pdf
    • http://thestarbusan.com/FileData/ckfinder/files/20210825_D7CDECC134CDE36A.pdf
    • http://ucinnovation.ru/admin/ckfinder/userfiles/files/dobumi.pdf
    • http://dailymaytrogiang.com/userfiles/files/18220438797.pdf
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cdd68ef1bc---kagalonirubuximifodag.pdf
    • https://samowar.ch/upload/file/mubirenenuwejenogaxo.pdf
    • http://alvit-bk.ru/userfiles/file/mujebanewemavebovonawunuk.pdf
    • http://okmarin.ru/userfiles/file/wuwokunubifukamobesud.pdf
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/0cae05d41a1b8eb62915a29dbe990130/64060670659.pdf
    • https://gifarlcm.com/upfiles/editor/files/71529128121.pdf
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a091f2f40d9---rukixavodila.pdf
    • http://brno-skoleniridicu.cz/ckfinder/userfiles/files/belogikavazakowerozokupib.pdf
    • http://teen.plovdivweek.com/js/ckfinder/userfiles/files/20423170497.pdf
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/mro1i2ofo4o6og42cg9ulssq7h/82746420767.pdf
    • https://ludifrance.fr/userfiles/file/fuvevunidor.pdf
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/ae3e53b625fb23c7a2d42e7a098a6b7b/49919176292.pdf
    • http://dragonspond.com/uploads/files/ratepenopotek.pdf
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16092d6b395e99---32529975300.pdf
    • http://wu-pao.com/upfiles/editor/files/sederamerizoxukelefu.pdf
    • https://legyenegyjonapod.hu/userfiles/files/worenosa.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=graph+exponential+function+worksheet
    • 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_off0000da76.bin
31323d1104b17c942acdcc9e49eca7adf4b9b2a3370a73c99bde69a2ef0f96a7
pdf-font-stream PDF embedded font (sfnt) at offset 0xDA76 17708 bytes
font_01_sfnt_off00010910.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10910 16792 bytes
font_02_sfnt_off00012127.bin
251b0cede22ceb038b98e74a7e0868468cb4c0b741d29243c0264d08c5eff1df
pdf-font-stream PDF embedded font (sfnt) at offset 0x12127 10996 bytes