Malicious PDF — malware analysis report

Static analysis result for SHA-256 b54c15c047a35d23…

MALICIOUS

PDF

73.7 KB Created: 2021-09-23 00:27:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 00b866b99fce8e67ddfddf32d6525c7e SHA-1: c16fe49035994f3f240611016a37ecc3cee6405c SHA-256: b54c15c047a35d23bf382d09c3e1eca5666ccb5d2b4f1fbd7c3c2722af88d919
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan variant. It contains numerous external links, many pointing to compromised CMS upload directories or disposable hosting, suggesting it functions as a link farm to distribute malicious content or phish for information. The presence of embedded URLs and the nature of the heuristics indicate a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://nomylo.ru/uplcv?utm_term=orion+tv+app PDF link annotation
    • http://lokalizacja-gps.pl/userfiles/file/tazivupagewuvuworekapali.pdfIn PDF document text
    • http://huabulaw.com/uploadpic/2021-9/file/2021091814452673499.pdfIn PDF document text
    • https://www.savininkai.lt/ckfinder/userfiles/files/34049625638.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e29cdae9b702ceb5293294f8e870bba6/68125515773.pdfIn PDF document text
    • http://bertoniamministrazione.it/bertoni/public/file/kuropidubanufotasovujisur.pdfIn PDF document text
    • http://erdbau-rauch.at/foxebixuzovizu.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b282473ead---467614578.pdfIn PDF document text
    • http://nawooelcs.com/upload/userfiles/2021/09/files/210909022113.pdfIn PDF document text
    • http://www.gpkoaee.ru/ckfinder/userfiles/files/perawodaxodixu.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161478a79408f1---duzozinatas.pdfIn PDF document text
    • http://esistore.lu/userfiles/file/98887742434.pdfIn PDF document text
    • https://woft-dining.com/webroot/editor-uploads/files/47324138747.pdfIn PDF document text
    • https://ms2gacor.com/contents/files/99745179906.pdfIn PDF document text
    • http://umbabox.com/userfiles/file/pelinojoga.pdfIn PDF document text
    • https://pieseautocomenzi.ro/userfiles/file/mojozuderiruroretasoto.pdfIn PDF document text
    • http://varvshistoriska.com/file/lalikubanozonewajozaxoruk.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/k7lgmreotijvm02nj8tb1qbdut/40958548973.pdfIn PDF document text
    • http://victoryelectricalsupply.com/ckfinder/userfiles/files/87791326133.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d8f5f81e80---80692233486.pdfIn PDF document text
    • http://haithuanphat.com/uploads/files/raroketamugiz.pdfIn PDF document text
    • http://elskenecologie.nl/files/871857375.pdfIn PDF document text
    • https://eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/lapobanidubexopidop.pdfIn PDF document text
    • https://www.sesc-am.com.br/Selecao/ckfinder/files/32707827998.pdfIn PDF document text
    • http://spy-military-labs.com/userfiles/file/48881102988.pdfIn PDF document text
    • 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_off0000c153.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC153 16308 bytes
SHA-256: 97f199fda69da32ec4f5dddcbbf9125afd8ff6af1fa2ffe5f237116e59c2ccb3
font_01_sfnt_off0000eb3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB3A 9988 bytes
SHA-256: 778bcbfdc2c7efccd449f102fa2abfb3b4432090c081c08f299f438e349ff261
font_02_sfnt_off0001017e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1017E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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