Malicious PDF — malware analysis report

Static analysis result for SHA-256 b607d8419b1a4e23…

MALICIOUS

PDF

84.9 KB Created: 2021-06-27 04:01:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8e63d06f63c4920bc7d2f16c0b865c93 SHA-1: 4b3600c6d98710492a8d0bf60ef5ba243baa05a3 SHA-256: b607d8419b1a4e23b55d6e926e414ad88d89af5b5afc259187b1c23a13f193d6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, directing users to numerous external URLs, some of which are hosted on compromised WordPress sites. The presence of multiple links and the use of UTM parameters suggest an attempt to lure users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • 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.
  • 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://chris-arnold.com/userfiles/file/xabagogipuzagez.pdf
    • http://bygreenpure.com/userfiles/file/34217915916.pdf
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/57645b1c5f842dbbc7e00d5bf5850977/vuxixajozimiwusud.pdf
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/987b053f581af6f3cb6ed1392dbed733/maredegoza.pdf
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be349e6a6aa---zarexibatazebe.pdf
    • http://skyline1968.com/clients/74864/File/98648093600.pdf
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/e10994d16aeee42e70589454c2c5c3af/nenerosaginikeli.pdf
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/8k63g7727pqelv5npclbqt57p6/fadimozif.pdf
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/e5ncn1p8i4qnf2gvctfp488p43/63968759729.pdf
    • https://widepolymers.com/userfiles/file/susapokonej.pdf
    • http://ecohouse-lab.com/userfiles/file/19246719480.pdf
    • https://himalmanpower.com/ckfinder/userfiles/files/2099246473.pdf
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9db79a6b5f---20800686567.pdf
    • http://reicar.dk/userfiles/file/78072342912.pdf
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fa246e6480---2553706227.pdf
    • https://lightingsystemscol.com/wp-content/plugins/super-forms/uploads/php/files/961193c0ac9f8b1b29e317ed307c9a0f/2586610720.pdf
    • http://delve-cr.com/uploads/figizufonaxeka.pdf
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094859a43e4a---sulazifugedaxabijazikam.pdf
    • https://infrastone.com/userfiles/files/54645239322.pdf
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/37f41c76f0d213c6b22b32114b9a119f/tidafanojifikavodopijibux.pdf
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd02f0b8322---gixodi.pdf
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/dc4587410e3737e3c1defe82b6a67cdf/rolemosetaz.pdf
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160789a594831c---rakogapavozonelesolixoda.pdf
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160a9e5638acb3---rutavibusinig.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=common+property+of+acid+and+base
    • 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_off0000e98a.bin
8c28db5d593a55082b71901ad793e099b1e7caf7433fc5a611143ade91b7513c
pdf-font-stream PDF embedded font (sfnt) at offset 0xE98A 16592 bytes
font_01_sfnt_off000114cf.bin
920ae575daa8edf61080892c57049fdd27f7036625087159357cda4d19ed63d2
pdf-font-stream PDF embedded font (sfnt) at offset 0x114CF 11020 bytes
font_02_sfnt_off00012e44.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12E44 16792 bytes