Malicious PDF — malware analysis report

Static analysis result for SHA-256 f95608626b67c2c6…

MALICIOUS

PDF

89.3 KB Created: 2021-08-16 18:48:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b0dd8037cfad0473146d8e0009fc9471 SHA-1: 1418dc12e13b0a7949d7257cddbf5765fa16bb39 SHA-256: f95608626b67c2c67ad257be7dab2d088b1e58fbba46fff1de4cd83226ca2c09
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains numerous external URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The primary attack pattern involves luring users to these external sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://nomylo.ru/uplcv?utm_term=afk+arena+new+codes PDF link annotation
    • https://acornschoolcharleston.org/wp-content/plugins/super-forms/uploads/php/files/2342367517759fc986c843437980e79b/purasawoxamaresonikasimer.pdfIn PDF document text
    • https://newtech-utm.pl/userfiles/file/jonerap.pdfIn PDF document text
    • http://nutricion-intravenosa.com/wp-content/plugins/super-forms/uploads/php/files/00a0822040eb2f54a6158b085dd783df/gelijagabibixivakel.pdfIn PDF document text
    • https://kltccompany.com/ckfinder/userfiles/files/28008171015.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/2896396fcee0de3e95076959bb63bd9f/tadolonezol.pdfIn PDF document text
    • http://karpatskiles.ru/store/files/50254793676.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac33e60fe14---96081205418.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bc47f22dd69---52393909903.pdfIn PDF document text
    • http://keralabiblesociety.com/fck_uploads/file/mipufaz.pdfIn PDF document text
    • https://fullmagicweekend.com/ckfinder/userfiles/files/50654793528.pdfIn PDF document text
    • https://aksukartela.com/images_upload/files/naradibu.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160abb23c332fc---45420207520.pdfIn PDF document text
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/3ca03b1cf4eb90246750d420a5197e03/jepabutonamen.pdfIn PDF document text
    • http://sten.kr/club/data/userfiles/file/20210721202624.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/84a58fb662a5a3246348ec8e99f71a9e/14038989291.pdfIn PDF document text
    • https://sindonis.com/userfiles/file/61597876509.pdfIn PDF document text
    • http://hoanggiaphatstone.com/upload/files/supasibuda.pdfIn PDF document text
    • http://bigband-ulm.de/userfiles/files/rosiwavawevoxufeb.pdfIn PDF document text
    • http://mousike.it/img_ins/files/zowejawidobizugoromukefo.pdfIn PDF document text
    • https://marikakozmetika.hu/editor_up/7837348042.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6c5427ebab---kewaw.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aa3a62326d---46693050247.pdfIn PDF document text
    • http://fonnepal.org/userfiles/file/88124145204.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e4bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fcd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCD6 10392 bytes
SHA-256: 868704c776b8d8d437733fd21a0ec36e903bbcee45f57d7feabecff3b2985be9
font_02_sfnt_off00011490.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11490 17076 bytes
SHA-256: 9540dfb5ca1fa2c06affc99fbcf5e2daa9ee9ecb2683dfc4bc3057e71499fc90
font_03_sfnt_off000140c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140C8 16660 bytes
SHA-256: 3e1a5c08b99c48cfa263cac2d0fa4fd7eb77e98f3e485c9afca6077663a68f55

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