Malicious PDF — malware analysis report

Static analysis result for SHA-256 894207b20a3ef80e…

MALICIOUS

PDF

77.5 KB Created: 2021-09-06 20:21:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b57d16fa1dba96bf8b803aaf1cf422e5 SHA-1: 591caa64141062b0fe170d39c586a103ad678037 SHA-256: 894207b20a3ef80e92df2307a6d0317accc8449f34b2c26a7343cf7e8a6e4b06
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. It contains numerous links, many pointing to compromised WordPress uploads and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, further obscuring its true intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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 http://apsara.ru/userfiles/file/xibeberamobiwexi.pdf In PDF document text
    • http://10glazsikeyrosa.ru/file/83035352034.pdfIn PDF document text
    • http://elcampoeco.org/FCKeditor/file/wesidowomeziwerazite.pdfIn PDF document text
    • http://bielwod.com/userfiles/file/49114046708.pdfIn PDF document text
    • https://nucamsa.es/userfiles/files/23017289118.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/5vtl1kllmb90mp3ilb2sa7438t/vijatumatilukivo.pdfIn PDF document text
    • https://ipssecurityconsultants.com/ckfinder/userfiles/files/84505443692.pdfIn PDF document text
    • http://cogersquest.com/clients/f/f6/f6194b381802d71b6842d6160e8859b1/File/medoditipomixeguv.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1607a199764835---55083974702.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076ca822e34a---32415984145.pdfIn PDF document text
    • http://luxcottage.ru/stroykamen/userfiles/file/78059715709.pdfIn PDF document text
    • http://www.tm-africa.com/beta/public/uploads/cms_filescms_files/nagolulorasusowepajo.pdfIn PDF document text
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/4ai0qtk309e68m10bgkmhpc539/64457567470.pdfIn PDF document text
    • http://thessalonikiflights.com/files/files/mukexosokosezepagub.pdfIn PDF document text
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/28f51afdc7135877770296e79fee1597/7057354941.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160c7c0cfecdbc---zosib.pdfIn PDF document text
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/ki5bs5cfgtol2e10o4mgp5ovmr/sowavobo.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1611b4f2d100fc---47519104526.pdfIn PDF document text
    • https://fertilizerproductionprocess.com/d/files/90790934570.pdfIn PDF document text
    • https://taucaotoccatba.vn/images/news/files/matuzavekogewipemev.pdfIn PDF document text
    • https://brazilairporttransfers.com/ckfinder/userfiles/files/31831694432.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=force+and+motion+quiz+5th+grade+pdfPDF 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_off0000ca4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA4B 17172 bytes
SHA-256: 27a16582c5db72e1877d93d58ceb75154bb66709b17d2b5d020f78d00da702b2
font_01_sfnt_off0000f691.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF691 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010ea8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EA8 11268 bytes
SHA-256: 80385954613433505fc54b455717b42e9aba0db9e36e6681087932799d58f067

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