Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5382730d2fa5e98…

MALICIOUS

PDF

86.5 KB Created: 2021-06-30 00:01:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 092f2a03af7d8bcf547b23df6943cea0 SHA-1: 27bd9f7a6054220576ef914752a50c33c3d3c295 SHA-256: e5382730d2fa5e9803e856d264319c46bab5180ed60f146900199d0597b1dbfb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external URIs and is identified as a link farm, with many links pointing to compromised WordPress upload storage. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://madmojo.com/fckupload/file/dirosix.pdf
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5b06a335a2---megufenibejo.pdf
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/9898ad998ee39efef20989971ed334a3/fesefemekoxetib.pdf
    • https://anjingliar.com/contents//files/84311575026.pdf
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076316c9b8d3---58271736978.pdf
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/5e53f735eba129a301bae9caa2ffff3a/75821135406.pdf
    • http://www.anieliasfx.com/uploads/textareas/file/67776677926.pdf
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081b9d835e9e---18789625602.pdf
    • http://meadescafe.com/userfiles/file/22041025790.pdf
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1607b4f0767576---kexipuvude.pdf
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/3a3de9182bbc847d50e8e827cdf52a4a/92569060546.pdf
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a392a3a059b---kogizov.pdf
    • http://dlt-nkp.com/fileupload//file/62250490090.pdf
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/rr7o8bjo5brppbio1pq950r0jm/79886546428.pdf
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f6473c4dea---20212405507.pdf
    • http://thaoduocvn.com/userfiles/image/file/34810156133.pdf
    • http://yummyschool.com/_UploadFile/Images/file/xobasevefogomolu.pdf
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/a7179e1b1fcb0612db15ef6fd3cb3e1f/50693456744.pdf
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/6cc166c48c45ac93761db3ae89f1a394/37308701833.pdf
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160844693a3aa6---80025267569.pdf
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/1609ad94a32a9e---kefedoze.pdf
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/oknec6378vqr7pu001cgfhaft7/rikemuvemitigezikek.pdf
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082ee299c8c9---kadanog.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=can+dogs+eat+taco+meat
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eeb0.bin
7304c7fc479ad410f793c48e87f93fa86e997bc4ee170e9c16d32008488bbd19
pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB0 17328 bytes
font_01_sfnt_off00011bf0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11BF0 16792 bytes
font_02_sfnt_off00013407.bin
b149356a7aae30103b2fda7c116404271f5ab06f780d44a2ded791f6687da427
pdf-font-stream PDF embedded font (sfnt) at offset 0x13407 10504 bytes