Malicious PDF — malware analysis report

Static analysis result for SHA-256 376526b4838d5d8e…

MALICIOUS

PDF

119.8 KB Created: 2021-07-17 02:12:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 97835df9c60542371352f6689808ed89 SHA-1: 3613edbc4c4dc2c912508eb447124a1b92ca185e SHA-256: 376526b4838d5d8e5949c4df581fb0be54e5f119839e54b7788a76000b31d431
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of links, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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 http://panziofabian.hu/fck_kepek/lokebujumoweva.pdf In PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a1e3b9ac2a9---mitebo.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/3bf7455f6bf3aad3c208058d431cda42/11748680137.pdfIn PDF document text
    • http://cablexconsulting.com/Upload/file/sidutefebakutadiku.pdfIn PDF document text
    • https://finances-canada.com/wp-content/plugins/super-forms/uploads/php/files/069944b8aaa218f9fdfb32fe9970e20b/90490285254.pdfIn PDF document text
    • http://aexpress.lv/index/images/up/file/71470024269.pdfIn PDF document text
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/c9dbeb7ac6256f2e002ed9ea71ef270d/10147430539.pdfIn PDF document text
    • https://dienlanhhonganh.com/images/pic/file/gunigedexalorojomad.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/20togaou6aok0fqmapk64tmvo2/kenizovonego.pdfIn PDF document text
    • http://insfilings.com/skyzone_classic/upload/files/54391650812.pdfIn PDF document text
    • http://clinicaveterinariacene.com/userfiles/files/sajobajogomelelujurijuxug.pdfIn PDF document text
    • https://aimara-bg.com/userfiles/file/46374301490.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b678a678d27---kovimujadovevotodipix.pdfIn PDF document text
    • http://kiuruvedenlukio.fi/tiedostot/file/67701215994.pdfIn PDF document text
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/10j8md3bv5edggjhnj14pq64l2/80023455177.pdfIn PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/160c4d88f07602---toruduxuvatisawigikositas.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af8f1089af8---malitubutulijoxu.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2cb38a4d0a---sunotu.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077cd6793663---robunedumizevamavut.pdfIn PDF document text
    • https://vydavatelstvoklett.sk/userfiles/file/7996601823.pdfIn PDF document text
    • http://thuexedanang247.com/uploads/image/files/zosunutiziponezega.pdfIn PDF document text
    • http://andrelandberg.com/userfiles/file/baxoreboledebad.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/0553f0216f5c361cda7a89260dd45e49/nugorofi.pdfIn PDF document text
    • http://chinajnbt.com/images/upload/File/32553982832.pdfIn PDF document text
    • https://pass-eco-energies.com/ckfinder/userfiles/files/2727947429.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=alienate+legal+meaningPDF 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000175fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x175FD 10044 bytes
SHA-256: d7bd4fe4f39269bb74f9fc3c62e9522ad5fe41472d502e1d3107df73b46c8be2
font_01_sfnt_off00018c3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18C3E 18088 bytes
SHA-256: d260d51077842087b34fa02778846ed2eef5b35f6154b9da48853bf45af6e0a1
font_02_sfnt_off0001ba13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BA13 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1