Malicious PDF — malware analysis report

Static analysis result for SHA-256 4316a6f6a708ad65…

MALICIOUS

PDF

86.1 KB Created: 2021-06-07 04:29:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: ff29264cdd4036ea555c04571625136a SHA-1: cec513f73b6b3bcf32a80de3dd9c74caccecde7b SHA-256: 4316a6f6a708ad65d7d260b3609740ea56edb0e21982aac786b82a9ec66090c1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains numerous embedded URLs pointing to compromised WordPress sites, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a spearphishing attachment used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://crewmak.ru/uplcv?utm_term=10.+s%25C4%25B1n%25C4%25B1f+biyoloji+kal%25C4%25B1t%25C4%25B1m%25C4%25B1n+genel+ilkeleri+ders+notlar%25C4%25B1 PDF link annotation
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084b088caf15---pomexomufixawafijumenad.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/160976cf3311af---8858404098.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/m1o87gm9t6urn0mtpaaoss5ms0/63797680541.pdfIn PDF document text
    • http://worldofpacifiers.com/editor_uploads/system/files/tegawezolepatazatirefaraw.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/334086cc2428104eb449aaf4f9ac8900/13397858533.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae113fa6f7b---47739978639.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b13bd28b05a---wowubovobunuzuzomuz.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a61867348bb---sabijewowate.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/16070b1a057560---jelowizanelis.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099bb8ba511e---42103301167.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/8e1d82f2c349f6a4639965fa34128f32/vetazodibomejiporekosab.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608c5fe03beef---zotemuxoxavadigufasa.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc2c631cb1---65284253172.pdfIn PDF document text
    • http://phantasos.org/userfiles/file/lemadivaginilukan.pdfIn PDF document text
    • http://ranaghatpchsschool.org/userfiles/file/82729249412.pdfIn PDF document text
    • https://capitaleny.com/wp-content/plugins/super-forms/uploads/php/files/8f67f900ea2775bf9ada6427ecf13887/didumetufo.pdfIn PDF document text
    • http://boilerservis.ru/uploads/files/midikowamimokadebilamib.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/e4cjkggorujl2maq9gao6lgqui/sekarukifoxujekak.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn 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_off0000f121.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF121 5772 bytes
SHA-256: 429459d6986327dd524fb508a2de248d9d5891bd6c465c1dc695816a9a24efe0
font_01_sfnt_off000104cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104CD 14904 bytes
SHA-256: e1b357f9578f388088ab8e5863e88a6a82f283cb72be4bbaf210fcde404df197
font_02_sfnt_off000130a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130A2 16628 bytes
SHA-256: 7e0c9fec9a12c84886eaba975e8cb448370b5e4909b47953f9031c563c368761

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