Malicious PDF — malware analysis report

Static analysis result for SHA-256 035a3387392db6ce…

MALICIOUS

PDF

76.7 KB Created: 2021-10-07 12:16:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: f93c32889536a42509be6de2534f8cae SHA-1: 9d05a011a910378cfa95f65aa9913354b815b891 SHA-256: 035a3387392db6cee43a50e7358c4807a4750db860b5d257a951dcff7a17545f
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as containing a link farm and pointing to compromised CMS uploads, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection further support its malicious nature. The embedded URLs suggest the document's primary purpose is to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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://garglob.ru/uplcv?utm_term=phil+collins+happened+on+the+way+to+heaven PDF link annotation
    • https://amgaa.org/temp/files/10591874680.pdfIn PDF document text
    • https://voziky-paletove.cz/mctree.cz/pictures/other/files/fusuxez.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/c077e859c0fc58f97df15ddfe027bdce/9978745924.pdfIn PDF document text
    • https://electroagro.es/pub/files/50543257733.pdfIn PDF document text
    • http://innersolutions-uk.com/file/14944966272.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/2f19enr5uhd534bjrefamag674/19852983581.pdfIn PDF document text
    • http://cameradungphat.com/uploads/files/46998641597.pdfIn PDF document text
    • http://goldenbaycruisesagent.com/userfiles/file/mixesojatodu.pdfIn PDF document text
    • http://iiiemjobs.com/FCK_Editor_Images/files/bixepikikivexexotapoduxo.pdfIn PDF document text
    • http://cabanagarden.hu/editor_up/32799584406.pdfIn PDF document text
    • http://nhatrangpalace.net/app/webroot/upload/files/xivoxefabaxovotaxuga.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/a1880c9d6f1fa2f341c456519f9a9b07/47766854568.pdfIn PDF document text
    • http://sugarfree-gelato.com/upload/file/33509627131.pdfIn PDF document text
    • https://euinsuti.ro/app/webroot/files/userfiles/files/lafuluke.pdfIn PDF document text
    • https://altinhediyeler.com/calisma2/files/uploads/49295640564.pdfIn PDF document text
    • http://ifaistos.reality.gr/~triantaf/images/file/43407018677.pdfIn PDF document text
    • https://terracetemayonetim.com/upload/ckfinder/files/39088668239.pdfIn PDF document text
    • http://dj-maily.com/uploads/pages/files/bijod.pdfIn PDF document text
    • http://ageofwonders.buka.ru/sadm_files/lisuwawerosuzipadik.pdfIn PDF document text
    • https://035620126.tw/upload/greenkitchen/files/lusutidolepufadasaraku.pdfIn PDF document text
    • http://orosweb.hu/ckfinder/userfiles/files/nupawep.pdfIn PDF document text
    • https://dennismaloney.ca/upload/editor/file/wosoraxuzobopa.pdfIn PDF document text
    • http://sladkiy-ostrov.ru/userfiles/files/jogolasakakuvozan.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/89afef1b19154be5c7031b6d85d5e14d/52041827621.pdfIn PDF document text
    • https://metrosecuritynepal.com/assets/userfiles/files/rovidagabedebejuw.pdfIn PDF document text
    • https://www.ksmt.edu.np/assets/ckfinder/userfiles/files/jefemivozaju.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/28639037442.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_off0000c7ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7EE 10780 bytes
SHA-256: 9fa784524f3cbbb9d7e33b272b5a6a7edf7d107e4281f98e7254e8151ec11611
font_01_sfnt_off0000e0c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f8d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8D3 16892 bytes
SHA-256: 5dd709bb0fc635dcee4cb4a2b85311d0f77eb904e01055a4f9d5228dfa89ff8b