Malicious PDF — malware analysis report

Static analysis result for SHA-256 13387ec634233285…

MALICIOUS

PDF

86.5 KB Created: 2021-09-05 22:24:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 6c57f191e8d66c8c7fb82327808fcbaa SHA-1: 0206c5025af1e2b496462a4984e0d04af042950b SHA-256: 13387ec634233285c53cf8a4ed8d85df7a00d34590a1fb31f72759663e747443
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, which is a common technique for executing malicious code within PDFs. It also features numerous external URLs, many pointing to compromised CMS upload directories, suggesting a phishing or malware distribution lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely involving the redirection of users to malicious sites via the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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=tax+system+in+usa+pdf PDF link annotation
    • http://riskhedgetech.com/uploaded/file/133388352060b985f2c22a6.pdfIn PDF document text
    • http://intergeored.com/upload/File/jupakaxejuzanupitutojo.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/2bu5e3p2qb1ldq4baofmcpe221/13107202897.pdfIn PDF document text
    • http://turinhotelcompany.com/userfiles/files/42920946238.pdfIn PDF document text
    • https://juhaszautovill.hu/userfiles/file/58765489792.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160973620c1774---mawijuze.pdfIn PDF document text
    • http://tomei4x4.jp/js/upload/files/dazevulorobelixabipixiji.pdfIn PDF document text
    • http://flemisterbauldingfamily.com/clients/8/82/82a21d9598fc66f9117a8fb7222c8fd0/File/xeleganibirugumovogotemog.pdfIn PDF document text
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608723a893be7---9089779078.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160af9ba61e04d---zegil.pdfIn PDF document text
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/2eb609lctp7ickj7jdtk3u5bd7/16446289669.pdfIn PDF document text
    • http://stressmanagement-karriere.de/userfiles/file/26134980410.pdfIn PDF document text
    • http://creatinglifeoptions.com/userfiles/files/25429510430.pdfIn PDF document text
    • http://www.amedna.com/userfiles/files/vawibaremexeneb.pdfIn PDF document text
    • http://kadh.kr/bobod/upload/file/kataxiwizawunonovanozov.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/160ad624a58e2e---19949067918.pdfIn PDF document text
    • http://firewheels.pe/userfiles/file/tiguzenududijova.pdfIn PDF document text
    • http://www.dilipprabhavalkar.com/images/file/zedami.pdfIn PDF document text
    • http://pharmabiosolutions.com/filespath/files/20210812120434.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160fda2c92fe4f---kiduzutajusibawolu.pdfIn PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/5b0bfcbfdbbe8cff633ed56349f03c7e/38597984892.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/65908479842.pdfIn PDF document text
    • http://www.humillacionyestrella.org/ckfinder/userfiles/files/bafiradixex.pdfIn PDF document text
    • http://fotostudiovaccari.it/userfiles/files/vefonorizopodelupa.pdfIn PDF document text
    • https://xn--80apefbdm9ah5g.xn--p1ai/userfiles/81829663738.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_off0000ed07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED07 17988 bytes
SHA-256: 05c43138b1e4e9748d21b2c7ce96947c94a49acd4904a0b3e00333858ff3402d
font_01_sfnt_off00011bfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BFA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013411.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13411 10672 bytes
SHA-256: 49b3ae83d7429f5c774df8801f88725b956def6ceab43410bc7ce34b42d23b52

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