Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb767e527b2415f6…

MALICIOUS

PDF

92.9 KB Created: 2021-07-27 17:01:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: acc04c0acec7f99cb01c17648135b43e SHA-1: f2eccb9c94fb5b6e3ddcde89976ce208d8ea1025 SHA-256: cb767e527b2415f6f14aa0ecaa54e0ddff873100d10ab58937f3cb068e28b743
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the presence of a link farm pointing to multiple compromised CMS upload directories, suggesting an attempt to distribute malicious content or phish users. While no scripts were directly extracted, the nature of the URLs and the detection name imply a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://soudurelauziere.com/upload/editor/file/73126053457.pdf In PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/242f2958eab2f32b8d80ae7af7864772/90138375287.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2bc4b7ac63---97664022816.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/0e1906b88cd16a389860f1a556ea96da/repekageto.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1ca58ed5ff---semogasasiwuzepinubujus.pdfIn PDF document text
    • https://www.groupe-coelho.fr/ckfinder/userfiles/files/suraxigufizunogaroluni.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d0c884659ce---fonulegeguwodozasepafadu.pdfIn PDF document text
    • http://specimport.by/files/files/jaderinonox.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/f6ad913fd5ddca2bf00fdcac16c757f5/wirujefizamup.pdfIn PDF document text
    • https://webmenuplus.com/images/file/39850845234.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096277ee334d---28450454597.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa0fb7671f6---22904319649.pdfIn PDF document text
    • http://globalsocialwlefaresummit.com//app/webroot/uploads/ckuploads/files/37131344174.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9f3c189653---35321125501.pdfIn PDF document text
    • http://thegioinoithatcamranh.com/media/ftp/file/rirexajew.pdfIn PDF document text
    • http://s2ipower.com/survey/userfiles/files/xinosazonenaxafod.pdfIn PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-6-10/20210610083125438820.pdfIn PDF document text
    • http://amazingindiaphotos.com/amazingindiaphotos//upload/fckimage/file/jasinowafewawavodize.pdfIn PDF document text
    • https://securitydm.com/slicice/file/zabotivuturijaraj.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/dv2kdnqhg4faipn153c9n61bjt/49153719464.pdfIn PDF document text
    • http://businessplan-capalpha.fr/mbp/upload/images/images/upload/ckfinder/91889794737.pdfIn PDF document text
    • http://timelessmebel.ru/wp-content/plugins/super-forms/uploads/php/files/91de468825d3479b714949262231d7ae/luleboxemozevu.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/e6808ba76aa357323a86df9d5e3ba82b/69033908881.pdfIn PDF document text
    • http://xn--12cbg9dihj7egda2g6a7dceb1d2cp4nvgf4f.com/datas/files/kexixabukodefaxoxuzufug.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/d1gqa2g5ntj71ufvgdjbqg7g37/83149877138.pdfIn PDF document text
    • http://kondicionery-vidnoe.ru/upload_picture/file/tovudesesolitobikawedetep.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=analyse+lin%C3%A9aire+acte+3+sc%C3%A8ne+5+le+mariage+de+figaroPDF 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_off00010273.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10273 11532 bytes
SHA-256: 0e4d31dfc32fa52e8fc965344ff1a8f427e2572dbd8a84fd850f897b49a0f60a
font_01_sfnt_off00011d02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D02 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013514.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13514 18192 bytes
SHA-256: 440b2d445b79257ee17fcee5a8ad39c1b87c2f7ad1a1984702f3757a76111ec7