Malicious PDF — malware analysis report

Static analysis result for SHA-256 376f800417370473…

MALICIOUS

PDF

95.1 KB Created: 2021-08-05 20:43:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: b21b79912f54c27fa6cf58dd707bfd5b SHA-1: 9d74e1251ec85904bf2c960c17cf61650c6f569d SHA-256: 376f8004173704739ecc8fb5cbf985036bab173365179077cc7ad80468ae8b61
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed for malicious redirection. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9888

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://tmtteks.com/files/lamurudobitowiwej.pdf In PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098d4d659933---78518958709.pdfIn PDF document text
    • http://morebricks.com/ckfinder/userfiles/files/83806622983.pdfIn PDF document text
    • http://clinicaveterinariagoitese.it/userfiles/files/63399429598.pdfIn PDF document text
    • https://galerie-louise.be/userfiles/files/nituzomezowa.pdfIn PDF document text
    • http://bodegaadrover.com/userfiles//imagenes/zavajonelusedezun.pdfIn PDF document text
    • http://allprintusa.com/admin/images/file/vedilos.pdfIn PDF document text
    • https://cald-lighting.com/wp-content/plugins/super-forms/uploads/php/files/fe793ece9cb979b13dffcb1755d2ce68/mufesozexilo.pdfIn PDF document text
    • http://vimbark.sk/editor_uploads/files/838195932.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/d74f5de3f098da7d5c5bc738c87c82cf/lovavaropawaxevos.pdfIn PDF document text
    • http://scherzerpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tubalujakexurivamevolipe.pdfIn PDF document text
    • https://unibel.pl/pliki/upload/file/kuribiwekaxelufakufesa.pdfIn PDF document text
    • http://weclassof86.com/clients/6/6d/6dc59c75684a9be5e3a4726337e2fa3a/File/82059438226.pdfIn PDF document text
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/etcfe9dqbolionanoi2d5jrpa2/kukigiwedeponoroxale.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607475b581ebf---kigidizipojakozozup.pdfIn PDF document text
    • http://clubselectionvoyages.com/images/file/87316185048.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607826a94f6c3---referawezowotogegu.pdfIn PDF document text
    • http://businesslegalgroup.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/99011398985.pdfIn PDF document text
    • https://perfecthospital.org/FCKeditor/file/vepage.pdfIn PDF document text
    • http://northmarking.com/userfiles/files/21979454806.pdfIn PDF document text
    • http://isdoor.ru/uploads/files/99314666486.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/757b39b939892334d2d246dd76257a6c/8106847026.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/30f8806d93445f8221739190c12910c9/98530638865.pdfIn PDF document text
    • https://trunglamdecor.com/uploads/userfiles/file/17673820855.pdfIn PDF document text
    • http://manninareunion2012.com/clients/0/03/03b30fdf9aaeeba733afadbef254ff7b/File/51779190062.pdfIn PDF document text
    • https://cleaner.pl/userfiles/file/xowijajutesinotefizobut.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=how+to+tell+if+a+battery+is+lithiumPDF 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_off00010f7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F7B 17492 bytes
SHA-256: 13a12ea08eba53a1d8ec205e908962fb0700c577c23ba35d7005db5b0ac80a03
font_01_sfnt_off00013d47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D47 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001555e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1555E 10808 bytes
SHA-256: fcd0cee41dbb3f167f4d0b63a8cd83b53b2178ccb90183bf7a662085e63afffb