Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdb0d9b488c5b83c…

MALICIOUS

PDF

88.1 KB Created: 2021-09-16 18:19:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d7dceb81af4e732790925dd3cf07c7f8 SHA-1: 7f5275fbeaba7c6ba386bf0c776f52f76a7bf1c3 SHA-256: cdb0d9b488c5b83caafa67668ef878e0ed03d05c35551b1083c27c2598254b16
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple compromised websites that host further malicious content, likely for phishing or malware distribution. The presence of numerous links to potentially compromised CMS uploads and disposable hosting reinforces its role as a distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/228c6ced6ca355de829b9f19f24312ed/radozom.pdf In PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/53666a64d845d0134c5342cbfe95537e/28223560343.pdfIn PDF document text
    • https://vjlabor.pitscovn.com/uploads/Upload/files/fexukubulexalet.pdfIn PDF document text
    • http://jatechkj.pl/upload/fck/file/91146315791.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/7998f43d5c3e1f07b03ab680253ea356/numesamopodurekimesibijig.pdfIn PDF document text
    • https://olterus.org/contents/files/jazujibevuteridegim.pdfIn PDF document text
    • https://ncltandatbar.com/home/ncltandat/public_html/dowalumniusa/ckfinder/userfiles/files/pakinet.pdfIn PDF document text
    • http://cmtl.in/uploads/userfiles/file/file/nejibupapepabebu.pdfIn PDF document text
    • https://kozmetikadunakeszi.hu/userfiles/file/fefovuzotoledade.pdfIn PDF document text
    • http://gpmpoolandspa.com/ckfinder/userfiles/files/74844441124.pdfIn PDF document text
    • https://polytex.de/sites/default/files/29347247317.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/c7a46e183f1912194506f0e869823126/77739816184.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/161302f3d03a68---tiwatagemewanola.pdfIn PDF document text
    • http://felixefontesadvogados.com.br/ckfinder/userfiles/files/75255793590.pdfIn PDF document text
    • https://euinsuti.uniluxgym.ro/app/webroot/files/userfiles/files/runadebibujatofikix.pdfIn PDF document text
    • http://businessdevelopmentcenter.pl/uploads/userfiles/files/sazefak.pdfIn PDF document text
    • http://automotiveenergy.cz/userfiles/file/89753794940.pdfIn PDF document text
    • http://biswasi.com/userfiles/files/67198509967.pdfIn PDF document text
    • http://studioindelicato.com/userfiles/files/58788569400.pdfIn PDF document text
    • http://www.sudeshnamaulik.com/fckimages/file/ligunuzukuxelijezij.pdfIn PDF document text
    • http://cottoneauto.it/userfiles/files/74400940833.pdfIn PDF document text
    • http://52fotki.ru/ckfinder/userfiles/files/sisife.pdfIn PDF document text
    • http://lse.hu/userfiles/file/98042672032.pdfIn PDF document text
    • http://sxhk365.com/uploads/file///wuzewonunibuv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=cordova+chrome+debugPDF 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_off0000f01c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF01C 18984 bytes
SHA-256: d5e4321c29463f29bba7c209d405b8eac616c920275a6ebf9ca867afec7cb0d0
font_01_sfnt_off00012233.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12233 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013a4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A4A 10644 bytes
SHA-256: 0a4c6726f90b54b89a27a9b4a6c42de73f9f5adea32e5c241958648a965c492c

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