Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba2e0b4ce918f9b8…

MALICIOUS

PDF

69.3 KB Created: 2021-09-21 23:28:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a5db8eb9f7e6cb41f0a71516fa613168 SHA-1: c8c6584a0339898499099be34430c14fbaca1aa0 SHA-256: ba2e0b4ce918f9b86830e418f1a7fdc70a38af2c91e87dc07e4103b5f2b40cee
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains numerous embedded URLs that point to various external websites, many of which appear to be compromised or disposable hosting. These links likely serve as a link farm to distribute phishing content or download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://pistant.ru/uplcv?utm_term=download+youtube+download+for+android PDF link annotation
    • http://ekorepetycje.eu/Upload/file/vorebadidelukelo.pdfIn PDF document text
    • https://gianlucabruno.it/dati/upload/file/79194740118.pdfIn PDF document text
    • http://aucoindeshalles.fr/menu/file/wopof.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/55567182766.pdfIn PDF document text
    • https://www.highettmetal.com.au/application/third_party/ckfinder/userfiles/files/94214642406.pdfIn PDF document text
    • https://cezartravel.hu/userfiles/file/kojudibefemidenir.pdfIn PDF document text
    • https://nasikampung.info/contents/files/nufirutuserilupuboga.pdfIn PDF document text
    • http://eros-arena.de/eros/userfiles/file/2649206405.pdfIn PDF document text
    • http://tdbakademi.org/userfiles/files/17902467906.pdfIn PDF document text
    • http://primaria-ciocirlia.ro/media/file/41647971163.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130176368fe7---meminidifarowododudaj.pdfIn PDF document text
    • http://teplospectr.ru/images/files/wunopubuvurorerexo.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/92e481656d48eb170c961f5524adcc2e/mowonapajesuba.pdfIn PDF document text
    • https://khmernative-rice.com/userfiles/file/25415195899.pdfIn PDF document text
    • http://tnslib.net/userfiles/files/27278200865.pdfIn PDF document text
    • http://tsg-edinstvo.ru/userfiles/file/wobazididurojugelumot.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/pjpteapd5p5v5p797th5np9kvd/795015509.pdfIn PDF document text
    • https://rais.bg/uploads/file/95556385778.pdfIn PDF document text
    • http://dansensvenner.dk/imagesfile///koxuzafufufolet.pdfIn PDF document text
    • http://nanumed.ro/uploads/files/sixex.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16140b83ab88eb---kuzonagase.pdfIn PDF document text
    • http://mos-craciun-inchiriere.ro/fckfiles/file/lulozobiwewukolib.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16148537dd2169---jijararoxaf.pdfIn PDF document text
    • http://salamino.pl/userfiles/file/62084207756.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b34e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB34E 14352 bytes
SHA-256: e4d96fc47c752f8f41b35e859209e77ac21cd7270c6d7a4c8c792a9ef82c8f45
font_01_sfnt_off0000d6e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6E7 10620 bytes
SHA-256: 2691816ab0e643c47936fe221f7b5e5a46185a2f86105aeb4fecc797ef14c81e
font_02_sfnt_off0000ef5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF5A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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