Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a28dc319e5ffe16…

MALICIOUS

PDF

79.6 KB Created: 2021-09-14 15:36:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7d2c93acbee7df0c179a20ce2f58f616 SHA-1: b7b80c104bdaa23cb166efb8f5446b4643e33b93 SHA-256: 5a28dc319e5ffe166aabef2aaa6a549bcae8bc6309f6e9df376c00fa91265d0e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised websites or disposable hosting, indicating a link farm or phishing lure. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with techniques used to redirect users to malicious sites, often as part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://smidgel.ru/uplcv?utm_term=nfs+most+wanted+ppsspp PDF link annotation
    • http://marienoellebermond.com/img/uploaded/file/2257577183.pdfIn PDF document text
    • https://aqua2go.pl/galeria/file/24663420365.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/bisejuxanugisawiwuzod.pdfIn PDF document text
    • http://generaldistco.com/images/file/28982696309.pdfIn PDF document text
    • https://tattica.byespresso.com/app/webroot/files/upload/files/87766224497.pdfIn PDF document text
    • http://marjoleintje.nl/include/userfiles/75670879160.pdfIn PDF document text
    • https://indiantalentjunction.com/milan/media/44949800281.pdfIn PDF document text
    • https://aljuboori.com/userfiles/files/firemalisa.pdfIn PDF document text
    • http://ikkosushi.com/uploads/files/51140078716.pdfIn PDF document text
    • https://beta.nhatthiengroup.com/files/uploaded/files/41164860589.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/2esf82q648t34pp1fprccl5pm2/lejetataz.pdfIn PDF document text
    • https://quizai.com/uploads/files/xalejarodimugozejeve.pdfIn PDF document text
    • http://foto-recepty.sk/images/fotky/lugibiwu.pdfIn PDF document text
    • https://langumeistras.lt/i/File/18322142076.pdfIn PDF document text
    • http://guides2alpes.fr/uploads/file/pofudu.pdfIn PDF document text
    • http://enjoybowlramenandpoke.com/uploads/files/47190730916.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/4kmbnfolfd2ukqvbfrdb4iggcq/83540358487.pdfIn PDF document text
    • http://lightofislamonair.org/uploads/files/reburijorunubesojagedumar.pdfIn PDF document text
    • http://sicilalluminio.it/userfiles/files/77858887366.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/96134442ce702758f3ab0b77367a3577/49411866320.pdfIn PDF document text
    • https://siroyensao.com/upload/files/zazaxiwogeteleni.pdfIn PDF document text
    • http://ehomeforeclosure.org/images/file/6641863378.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1613a3613a3421---bipegibaforitosirufovemu.pdfIn PDF document text
    • http://aajude.pt/backoffice/ckfinder/userfiles/files/33286508090.pdfIn PDF document text
    • http://www.css-jp.com/upfile/files/2021/09/05/96909230913.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_off0000cc14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC14 10484 bytes
SHA-256: 1b2a29734d925978d3aba4e2456cf6788c00101a9490789dde3832b9e9807b5e
font_01_sfnt_off0000e3fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3FA 20080 bytes
SHA-256: 825d90ab426f03dc4064f2a8635ffbb8514c073346f8a37af6d933c4555751f0
font_02_sfnt_off00011860.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11860 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1