Malicious PDF — malware analysis report

Static analysis result for SHA-256 7756957b72885ac0…

MALICIOUS

PDF

73.5 KB Created: 2021-05-21 13:42:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c5f66f9a5f35227024f75dc5dce51610 SHA-1: 4c7b87981766f0b1b5df19e46db7d936ec50c0da SHA-256: 7756957b72885ac023c4a372beed749fd9ee51012e28fd9fddb324efb73fa9ff
176 Risk Score

Malware Insights

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

The sample is a PDF document that contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of embedded URLs and the nature of the heuristics suggest the document is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://orgue-chantepie.info/FCKeditor/upload/file/sagazozudelora.pdf
    • http://clarksville.net/wysiwygfiles/file/73812025334.pdf
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608087e8005f8---nekox.pdf
    • https://amerismithenterprises.com/wp-content/plugins/super-forms/uploads/php/files/7247f4f923059f36595a8549c6db35c7/mumerunereze.pdf
    • http://orbitsecurity.qa/pro_mvp_tech/uploads/file/wileba.pdf
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079e4888556b---9613204210.pdf
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a421ec69650---14778928133.pdf
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a751779da77---9833750951.pdf
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099931297abe---gitedekazobirukupi.pdf
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/889c2ab6201064e2fa25e14f8d1ab45d/jitefibori.pdf
    • https://botorka.ro/userfiles/file/80870689280.pdf
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/3jjq1kn36l77jh87o6965qtaga/nagijunug.pdf
    • https://liniagdanskzydowo.pl/files/51559588337.pdf
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160831dd9a3e8f---dipejefolu.pdf
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/1607093330b7fb---ripogalejowik.pdf
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607d9dad45ef1---xekonugatekujajonomabewu.pdf
    • https://accuratesearch.com/userfiles/file/27689278493.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=dreams+by+langston+hughes+analysis+pdf
    • 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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e1d9.bin
8fe923821b72723840031cd623ca7e27675c60a19393e8794cf61d1bd7f95a33
pdf-font-stream PDF embedded font (sfnt) at offset 0xE1D9 5696 bytes
font_01_sfnt_off0000f51b.bin
da5c14f1dfed3fd075b17d6bcb22a82dad587fe4b7e9ec5a47bd14a67af01d4c
pdf-font-stream PDF embedded font (sfnt) at offset 0xF51B 10492 bytes