Malicious PDF — malware analysis report

Static analysis result for SHA-256 af5238b74e4251c1…

MALICIOUS

PDF

74.8 KB Created: 2021-09-08 00:34:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c2e6f72502ac104eb87f6fc7179fc6fd SHA-1: 935a7604a704960bfb2f5d9d0798ce216eb23d9a SHA-256: af5238b74e4251c15ced3f6ad1665a2f2b58f892e1556dc9d72d0fd95c226346
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to potentially compromised websites and disposable hosting. The presence of external URIs and a compromised CMS upload link farm suggests an attempt to distribute further malicious content or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://tailormade-sales-marketing.com/userfiles/file/12933630523.pdf In PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611f486463c61---pixazukozuvivolipokajemop.pdfIn PDF document text
    • https://studyhalltracker.com/files/file/48026979306.pdfIn PDF document text
    • https://nadrozmerne-sklo.cz/uploads/zezuz.pdfIn PDF document text
    • http://aktasmatbaacilik.com/resimlerfiles/lawavatedifixasejiwozom.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/gp5kuj9prnmhdlv8p39jej7ob5/51210707205.pdfIn PDF document text
    • https://ritascreation.com/userfiles/file/pezivevozimul.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a51ee4a0c0f---xavinalamepuf.pdfIn PDF document text
    • http://synphabase.ch/upload/file/wakepekigidujuvu.pdfIn PDF document text
    • http://dztechfin.com/upload/file///nanowovesavoziwazezo.pdfIn PDF document text
    • http://ride.hu/images/uploads/files/52457202163.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d29379bd26---27735736633.pdfIn PDF document text
    • http://clinicaveterinariagussago.com/userfiles/files/76014522189.pdfIn PDF document text
    • http://suacona.com/clients/16856/File/nutozadupa.pdfIn PDF document text
    • http://everest-c.ru/ckfinder/userfiles/files/xipojokebevupimubix.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=2004+chrysler+sebring+convertible+repair+manualPDF 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_off0000c1d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d9ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9EE 11464 bytes
SHA-256: f48df0308e9041f5b2e392ee810d3bdb53b86e01f6ceeb8a98c3b02671b92153
font_02_sfnt_off0000f4bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4BC 15980 bytes
SHA-256: 4c68736e8971b25114926593bb790e3b08070526ca33d6f131987414dec38977

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