Malicious PDF — malware analysis report

Static analysis result for SHA-256 084b42c0d94d4bdd…

MALICIOUS

PDF

81.0 KB Created: 2021-09-04 01:20:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: a602b5e5cda0b8b53bd38d10e6501fb7 SHA-1: 244ef363d291cf45aa8c9a2af29c0949d21998c8 SHA-256: 084b42c0d94d4bdd0aa3d1a62af1e8e89c0a4a377fdd55ae6c4fc8d4e26191fc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users. The presence of embedded JavaScript, though not fully analyzed due to obfuscation, likely facilitates the redirection or further payload delivery. The overall pattern points to a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://catamma.ru/uplcv?utm_term=convertir+de+pdf+a+word+i+love+gratis PDF link annotation
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/k6u5q72pq9cpfsftb4d360mi10/lodetiridekekonoze.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/27c155164ea84fd7a76f4b8be8aac09c/39884238713.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/lafrcn04r5b43qqmfgjb3erh25/30431318978.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16085227fae8ac---zikaxuvemexi.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160700601860b9---41696113416.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/t7eshjb1kubapkkdn3mf2cgft2/89177610762.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d88195ef238---darisineladimu.pdfIn PDF document text
    • http://nanobubblevietnam.com/uploads/userfiles/file/45825547226.pdfIn PDF document text
    • https://ustunbilgisayar.com/userfiles/files/xowirasebutiveran.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcfd8ac9baf---wobuvokij.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160840f526607a---fizopojixapolupajuvasow.pdfIn PDF document text
    • https://leuphuotcamap.com/uploads/image/files/nojixadosotabigodetubu.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160f9536d20cf3---50055997724.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/2ba0282bd0d606cf6215f151348de9b0/97109487181.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/52220641431.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/160864db5c1739---pavolamedapibafaviludu.pdfIn PDF document text
    • http://web-news.eu/www/pkpar/userfiles/file/84911392321.pdfIn PDF document text
    • http://domosplast.hu/files/file/74179506586.pdfIn PDF document text
    • https://aadharshilaschool.org/userfiles/file/wawivawutiven.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/86425fb82f8bc44007929162ac9394a0/86910579696.pdfIn PDF document text
    • http://pawsandtiaras.com/ckfinder/userfiles/files/zuridemezavi.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/kfun4p29b965bg3cvv2r96qe83/loxinelojazirutorojek.pdfIn PDF document text
    • https://universitecentrale.net/uploads/FCK_files/file/69309919615.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_off0000d21e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD21E 19580 bytes
SHA-256: 4fa0d18ef1035abaaab71b195c5fac4c642f8e0fb0cd3b45921a76efe90238b3
font_01_sfnt_off0001051e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1051E 10856 bytes
SHA-256: c30eb02f5929c1c309be4433825fcf4bbc2095400353acc03f2f3fa426bf014c
font_02_sfnt_off00011e3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E3B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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