Malicious PDF — malware analysis report

Static analysis result for SHA-256 f228e3efe7e57aca…

MALICIOUS

PDF

88.2 KB Created: 2021-07-04 06:51:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 0240043b0f1d9859dd860e1dea5ed8e2 SHA-1: 04bda3bdf6ccd0e1574d06d2eb7341bc27e3188c SHA-256: f228e3efe7e57acafa125b81435be2536336ebfd0dec867635229cb12f847266
156 Risk Score

Malware Insights

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

The PDF document contains numerous links pointing to various domains, many of which appear to be compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple external URIs and link farm characteristics suggests an attempt to redirect the user to a malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://pistant.ru/uplcv?utm_term=what+does+the+word+philosophy+mean PDF link annotation
    • http://asfalon.com/__files/file/19029369658.pdfIn PDF document text
    • http://cokhiminhhien.com/media/ftp/file/nopazamara.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1607f50eebeaa6---9190767173.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/77cd863aa5b939fb1630eb937745ae48/31383839366.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/9bc69e2716d86ae714a7a6743496a79a/97495123362.pdfIn PDF document text
    • https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/867a30e0d7262f086d84d6ec659ec60b/80379153962.pdfIn PDF document text
    • http://ailizia.com/userfiles/wupez.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/5353dd88bab3b43b3ed9077bc7719391/tesegifigudadizaf.pdfIn PDF document text
    • https://kartplast.com/resimler/files/kaxotupuzavip.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b680a2b9e5a---975887435.pdfIn PDF document text
    • http://architettodrabeni.it/userfiles/files/susonuwokivola.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16098b76917fdd---3100254776.pdfIn PDF document text
    • http://rana-international.com/userfiles/files/82865902032.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/45a61ac77b077b7a6c6306699ca01eaa/64271075159.pdfIn PDF document text
    • http://dallassymphonyleague.com/clients/1/14/14bb4a025281f1a32078cb68571f7cf3/File/falunolapijotep.pdfIn PDF document text
    • http://wildpflanzen-planung.de/file/19753517312.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bb3760eadc6---47125786056.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607b24daa2b32---19889946725.pdfIn PDF document text
    • https://hasekei.jp/userfiles/file/80268185203.pdfIn PDF document text
    • https://aljazeerahpetroleum.ae/userfiles/files/potexamaxelikojonalu.pdfIn PDF document text
    • https://afayl.com/userfiles/file/16933619554.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160876f9bd9f34---39439127008.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160790b15ed91b---kulijug.pdfIn PDF document text
    • http://kingcraftviet.com/uploads/ckfinder/files/53275404903.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/160df903ad02f2---57124583841.pdfIn PDF document text
    • http://www.asslar.de/downloads/givosipu.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/zurikes.pdfIn PDF document text
    • https://cls-toronto.com/wp-content/plugins/super-forms/uploads/php/files/84c905ee64716541a25363d57a952fff/tigojab.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_off0000f882.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF882 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011099.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11099 10852 bytes
SHA-256: e4d2e1bb5ce7283577983903b50a5b2cb12f4b190c01fb4b0347d0304786ca53
font_02_sfnt_off00012983.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12983 16132 bytes
SHA-256: 89ee436e2ca8dacc81e7ef352acb37f6e8c364f7475f3a895ca1b1b2f2429e8f