Malicious PDF — malware analysis report

Static analysis result for SHA-256 036199a98af9f27d…

MALICIOUS

PDF

87.2 KB Created: 2021-06-28 00:48:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 75fe421a048422356389a9a9d43b4b24 SHA-1: b9dbdc08eb0d2ff5b7e60193ae54ec0edbd42e91 SHA-256: 036199a98af9f27df9e1c23b633c33c7f1c581a5c86b85800e4914f700ef6b1e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external links, many hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript suggests an attempt to execute malicious code upon opening.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090f23e4acac---25133175985.pdf
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/2d51ff7c891bf40fb8d9b98fcc20cba7/61747993880.pdf
    • http://citadelcaralarms.com/userfiles/file/gukatafoxotosivemakigatu.pdf
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/df6d1afc20c81eef99fa74291e0ad8e8/54735317172.pdf
    • http://lubrifianti-auto.ro/files/file/52797661111.pdf
    • https://accesoriosalmayor.com/images/userfiles/file/30879724888.pdf
    • http://ikuma-car.com/js/upload/files/77727276180.pdf
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607f74f080e41---20639599950.pdf
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160898e19548f3---43220152446.pdf
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097d29186c2c---21796928567.pdf
    • http://batiment-tunisie.com/userfiles/file/nabenidivuni.pdf
    • http://axwelindia.com/uploads/25546866493.pdf
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8edcabacc0---mapimabut.pdf
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/vemr418ckk68v87btphq89f296/xiginizofoxelojituxit.pdf
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/cdbee786fbc0c3a6f86a60736b0cc873/babazalixomerawaw.pdf
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/4f2880d60279d472c2fe161063fe81d7/sodir.pdf
    • http://meteosputnik.ru/userfiles/file/fogitamakexuj.pdf
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/2a2481aa0578df841db46479354dfedb/55503077683.pdf
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/39al30mks9e94c3n79uthuoqn0/80011570882.pdf
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/abeab3dc9ff9e2595122b72b9ae81d61/xewexegitokital.pdf
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160c6aedf899c9---53528724869.pdf
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/04c31b53a9f899efd08ad44c6fd489f7/10489672445.pdf
    • http://ahkkpcm.org/userfiles/gawopugidumizawanuwiladat.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=high+caves+hidden+painting
    • 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_off0000f481.bin
8377e04768c262e6e02616505a1017184107db1d568419d6edb3a50e8203e342
pdf-font-stream PDF embedded font (sfnt) at offset 0xF481 10584 bytes
font_01_sfnt_off00010c6a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10C6A 16792 bytes
font_02_sfnt_off0001247c.bin
158eb90b250d89e7046eca41015756cf75029a9c9f384892794ddeafc81ab6ce
pdf-font-stream PDF embedded font (sfnt) at offset 0x1247C 17052 bytes