Malicious PDF — malware analysis report

Static analysis result for SHA-256 451019d78dd4db6b…

MALICIOUS

PDF

71.0 KB Created: 2021-09-19 09:31:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 1d9caf109f947c03247534daac0e79f4 SHA-1: f467116ce569e953e798d6000e87e1863efd2693 SHA-256: 451019d78dd4db6b3ac2870b1ac3d8ef4483ba43568f6de829e83f19d57fb28e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features a link farm pointing to various PDF files hosted on potentially compromised websites, indicating an attempt to distribute further payloads or conduct phishing. The ClamAV detection and ML classifier strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://grouptm2.com/contents/files/83766682078.pdf In PDF document text
    • http://sweatrinserepeat.com/ckfinder/userfiles/files/linejometegu.pdfIn PDF document text
    • http://liyangah.com/Upload/file/79635044818.pdfIn PDF document text
    • http://kisito.com/userfiles/file/8692990804.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/ihcafutaasm812ilcsqthr27hh/tireletoko.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f9742a3713---sexegidokovudi.pdfIn PDF document text
    • http://mwcapital.net/ckfinder/userfiles/files/rukenezotogu.pdfIn PDF document text
    • https://apra.pl/files/file/wemawazumisokefevimejibad.pdfIn PDF document text
    • http://unsersohn.com/images/file/luxodomilavoxudupeviro.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/161468325b8dab---82469843569.pdfIn PDF document text
    • http://borisovhlebprom.by/var/upload/file/wijosuxituvajukitaw.pdfIn PDF document text
    • https://n-tlg.com/files/file/61579580773.pdfIn PDF document text
    • http://drigungkagyurinchenpalbarling.org/upload/userfiles/files/wisafimaso.pdfIn PDF document text
    • https://lenaoyunlar.net/calisma2/files/uploads/bofekelo.pdfIn PDF document text
    • https://cfacgroup.com/uploads/FCK_files/file/40818637451.pdfIn PDF document text
    • http://elcolono.net/userfiles/files/41215878955.pdfIn PDF document text
    • https://foundlight.ca/home/foun6192/public_html/files/custom_files/file/48727116391.pdfIn PDF document text
    • https://luxesystem.site/js/ckfinder/userfiles/files/2448637079.pdfIn PDF document text
    • http://abwingstop.com/uploads/files/kodogazatanoxesef.pdfIn PDF document text
    • https://ksboutlet.com/file/files/35951081811.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/1614110d924a9e---kijogi.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/161468fdd326d6---70369387686.pdfIn PDF document text
    • https://bandai-k.com/userfiles/file/7744347975.pdfIn PDF document text
    • https://shreenathtechnologies.com/userfiles/file/22804003780.pdfIn PDF document text
    • https://xuantruongtech.com/images/ckeditor/files/46467351783.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=pokemon+games+for+ppsspp+emulatorPDF 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_off0000b633.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB633 15376 bytes
SHA-256: 5038a2b64c5f4cf608ef91b6cb03498384f996f8a92a88c2ba5b23a73fb90738
font_01_sfnt_off0000dd2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD2D 10800 bytes
SHA-256: ef2134411e16769293f1bc8d87a166dac686866fc415bd917c736a415f488fa5
font_02_sfnt_off0000f629.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF629 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1