Malicious PDF — malware analysis report

Static analysis result for SHA-256 44b1411fbb95ac05…

MALICIOUS

PDF

83.3 KB Created: 2021-09-03 23:51:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: fecc25932a95fd38e2c41518a7a6fdce SHA-1: 81cad19f811ca4c3ba677a3fb1a06c8101336529 SHA-256: 44b1411fbb95ac0599a67da3eceaa01f8f9d4fbcefa429c4d7ff3395892e80a0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to various websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a phishing lure, likely leveraging JavaScript for redirection or obfuscation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://krisoc.ru/uplcv?utm_term=lirr+hicksville+train+schedule+pdf PDF link annotation
    • http://rnralpha.cz/res/file/75783837127.pdfIn PDF document text
    • http://parfumerieindex.nl/images/uploads/1207427938.pdfIn PDF document text
    • http://alisawedding.com/upload/users/files/joromexotab.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a280dd7b35d---60596945238.pdfIn PDF document text
    • https://pasarantogel.com/contents//files/23357541689.pdfIn PDF document text
    • https://art-eria.pl/mandarynka/pliki/files/15147189437.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/5960380487dc701068e45de74012db0e/givuvivegiwoxokurufi.pdfIn PDF document text
    • http://reklamavysocina.cz/UserFiles/File/libikujodixijodoxamokobu.pdfIn PDF document text
    • http://salkim.com/userfiles/file/22697693453.pdfIn PDF document text
    • http://alfavs.eu/userfiles/file/25863319190.pdfIn PDF document text
    • http://righetti-ticozzi.it/userfiles/files/5913690473.pdfIn PDF document text
    • http://premium-h.info/files/files/67810559502.pdfIn PDF document text
    • https://parquesanalbertohurtado.cl/ckfinder/userfiles/files/lezerapele.pdfIn PDF document text
    • http://tianlanlawyer.com/filespath/files/20210828045441.pdfIn PDF document text
    • https://ev-owners.jp/userfiles//files/lojunenariwojixavasomok.pdfIn PDF document text
    • https://kheops-so.fr/ckfinder/userfiles/files/50262621921.pdfIn PDF document text
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/702978894bc7c725a847e6cce45b7adc/vituketafasobeba.pdfIn PDF document text
    • http://telecycling.org/files/file/kexomibunab.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f9c723ac22---zosapaxifirolelilitefaw.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/dljnmm4s3u7ek5nu0itfuna98p/xugiwa.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/tasagojekamatubadi.pdfIn PDF document text
    • https://associazionebriciole.it/public/file/ribuliroxuluf.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160841ec471191---50990701820.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608431f62a49f---novupuzamajuk.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_off0000e1d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1D8 17260 bytes
SHA-256: 4ebe9d3c3411d001360ed8666eb57dc84ec205f4c0db70c29798a60879f65a40
font_01_sfnt_off00010e28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E28 10812 bytes
SHA-256: a65d194196f67d4606ebb3d4722aaa7fc80f16151cd8c4ac58a7157744055535
font_02_sfnt_off0001270b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1270B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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