Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9c548dfd8053500…

MALICIOUS

PDF

75.3 KB Created: 2021-09-06 14:19:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c7927e4b32f3cc7c523fe82be66691eb SHA-1: 00ce7cca623d2012889cd2939f066a3cac0115b6 SHA-256: b9c548dfd8053500b5b65275774125fdd106afbf885ed797fe3d87dca7e39aba
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users. Additionally, the document exhibits characteristics of a link farm, with numerous URLs pointing to various domains, some of which are hosted on compromised WordPress sites. This suggests the PDF is designed to lure users to external resources, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://dzido.pl/userfiles/file/jerunasi.pdf In PDF document text
    • https://ndmoyun.com/calisma2/files/uploads/23776551315.pdfIn PDF document text
    • http://gwtcs.org/Content/uploads/files/44356989903.pdfIn PDF document text
    • http://indovinandoilmondo.it/themes/userfiles//files/nivajekakevupetano.pdfIn PDF document text
    • http://food-cloud.com/home/food-cloud/www/site/site/data/files/zulivefaz.pdfIn PDF document text
    • http://www.ssc-ras.ru/ckfinder/userfiles/files/guvimi.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/dbahm91j8no9b1uj1ncote49qf/80935060085.pdfIn PDF document text
    • http://vizesblokk.hu/files/file/12468614169.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b60d9f19779---woxaz.pdfIn PDF document text
    • http://www.bandungmesin.com/file/23404376225.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/52881756761318166dba92.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/fead229398bda12a2bdeaa17f1820dc0/94964132016.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/jj8bink94kt6sef8gqchbhir3t/27827849580.pdfIn PDF document text
    • https://chachachat.info/js/ckfinder/userfiles/files/kitapuse.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612506eb0c9c9---53339971798.pdfIn PDF document text
    • http://honda-vo.com/upload/file/5827475947.pdfIn PDF document text
    • http://ttccid.com/userfiles/files/19339934084.pdfIn PDF document text
    • https://stka.gr/ckfinder/userfiles/files/fufawijikapapari.pdfIn PDF document text
    • http://drukarnia-skawina.pl/app/webroot/media/files/xifozidejuroko.pdfIn PDF document text
    • http://baheth24cars.com/ckfinder/userfiles/files/99139415055.pdfIn PDF document text
    • https://jambukuning.com/contents//files/bijefujimemilu.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/bil39ovedveh9e9g3cpe1kmp52/datowafofopemeda.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=nouns+pronouns+adjectives+verbs+worksheetsPDF 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_off0000c265.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC265 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000da77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA77 16680 bytes
SHA-256: 19f57d6a01f6f54345d185c9bae79de64c3098f61a0cdf4a402c501ebc2dd2da
font_02_sfnt_off0001059b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1059B 11156 bytes
SHA-256: 208a99ab273f40709ec72f913d3f13d026e0680aa9ccfdcc14a140494da6537e

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