Malicious PDF — malware analysis report

Static analysis result for SHA-256 03925b3a3853b49a…

MALICIOUS

PDF

83.9 KB Created: 2021-07-10 07:11:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: a170b1e552dba8f9ba25e00f877753bf SHA-1: b24ab85c5684d2609c4e10bff4acb08626b9d247 SHA-256: 03925b3a3853b49aa3a407009a551b1fbbb592bb776bdb9fbacc7bf1fc22222a
156 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to multiple compromised WordPress sites, likely intended to lure users into downloading further malicious content or visiting phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. Although no scripts were directly extracted, the nature of the links suggests potential exploitation or redirection to malicious JavaScript.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160d0033e19ce9---ponevakavupotupor.pdf In PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/2bai9s4rr82evghqt7ptbj1n53/balinapibowelab.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/1d6037a4a90d2436110cd4bbe74c3c80/vozofagagafalojepebuno.pdfIn PDF document text
    • http://jtylek.pl/Upload/file/razirobosapabemikeru.pdfIn PDF document text
    • https://istocdukkan.com/userfiles/files/nuvanumeba.pdfIn PDF document text
    • https://mvpartners.be/images/uploadedimages/file/53503142807.pdfIn PDF document text
    • http://abacusnancy.com/userfiles/file/66207280535.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16094217c2dbe4---45089575236.pdfIn PDF document text
    • http://allprintusa.com/admin/images/file/85464356370.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a38de7ca603---98285113566.pdfIn PDF document text
    • http://one9five.com/userfiles/files/24768582376.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160bf8b7253784---direxa.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/a76cf5f9e61fc573013ae5028b3d0eb4/bopaxuvuwok.pdfIn PDF document text
    • https://anukulagrotech.com/ci/userfiles/files/36323987239.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160806d180af45---ragidunaxazan.pdfIn PDF document text
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078093d4aa53---xipinajiroxuguzowuj.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b865f65b8f1---xewojapudimorazonikil.pdfIn PDF document text
    • http://jvcc.cn/ckfinder/userfiles/files/21070113143688527465sf3.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dcffe556bd---79067057630.pdfIn PDF document text
    • https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/c3fc365cc9b44c59c416f90b8145dd49/nenujonexuferuxigamapur.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/6fbf57a9a6970bc595fbd8e7d3aab3e9/63210659569.pdfIn PDF document text
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/a209f504716175079228698e92677607/24643140290.pdfIn PDF document text
    • https://ckmusicdesign.nl/userfiles/file/jutikogat.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/160b461b8ab49a---28570995900.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=atypical+squamous+cells+presentPDF link annotation
    • 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e5e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fdfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDFB 16600 bytes
SHA-256: d34794cd8a42d5fe6dd33f392962e560f38a87b04121df25aa61a120c37e5805
font_02_sfnt_off0001292c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1292C 10876 bytes
SHA-256: 164c0cd46791c8365584d0877a3d8ce52b64cfcacfda701830607e8c77d02118

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