Malicious PDF — malware analysis report

Static analysis result for SHA-256 d12c4e980d3e00c8…

MALICIOUS

PDF

85.6 KB Created: 2021-07-13 15:57:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 972bba00222881f4337f323d60b822c2 SHA-1: a6fdef7bf7db8f0539bd9c1190f02d3b6194195c SHA-256: d12c4e980d3e00c8b2f54ca434664c2b6eecf6aae1f15f52ac05a6348575f358
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting, likely intended to redirect users to phishing sites or download further malware. The PDF structure itself does not contain readable content, but the embedded URLs and heuristic firings strongly indicate a malicious intent to lure users to external, untrusted resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://synerhu.ru/uplcv?utm_term=packaging+and+materials+handling PDF link annotation
    • http://remproekt-m.ru/admin/ckfinder/userfiles/files/62474585315.pdfIn PDF document text
    • http://scales-center.com/shop/fck_file/file/49060549495.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/81066293699.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/jtem2het5j12tep2ir967fp0a1/56578533607.pdfIn PDF document text
    • https://jurad.eu/files/file/12856669503.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160bfa24dd0440---nugadurafujeguwusofilak.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/160a499550dcc4---63167257256.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/007eac220051d664a00c24b3ee063957/dosimazikab.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1816db6e38---zetejuwofofinugadunodasu.pdfIn PDF document text
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/4af5761cfb12b54a950944d39a586db5/zixezobugidofusimukuneru.pdfIn PDF document text
    • http://prinsart.ro/uploads/files/11368714527.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/23fccafe6a1cc8a04cad60e20570e2bc/bikonin.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f17d05c64a---duvesenusu.pdfIn PDF document text
    • https://ljlconst.com/admin/images/file/80125757936.pdfIn PDF document text
    • http://shiraz.sk/ckfinder/userfiles/files/vufuxurikatudosiviwedita.pdfIn PDF document text
    • http://doverhighschoolhalloffame.com/clients/2/2d/2d76883e1086210ef8e2c43836b0327f/File/74323146652.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/f642013f8bfa1dd8831c9daac373b03b/vupukuz.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a9579e654cb---duzorurubadodadeneged.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607879e349050---38607522076.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb41ea64cf5---nuzijitamatadozesu.pdfIn PDF document text
    • http://tencanpowder.com/d/files/jemalew.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

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_off0000ed67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED67 16792 bytes
SHA-256: 8b40ef1f519295e5caf511f4dfa13e55961627471c4773adebc12cd42a333633
font_01_sfnt_off000118b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118B8 10788 bytes
SHA-256: 6a43c8e8542581d800bc9790370ce88fdee5b4d98502cd9daa905c4a396668c5
font_02_sfnt_off0001312b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1312B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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