Malicious PDF — malware analysis report

Static analysis result for SHA-256 a38e36aa52953613…

MALICIOUS

PDF

70.3 KB Created: 2021-09-21 21:13:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: da40a087752b377a165757bb76ec3f2c SHA-1: ddf3cc499e5b63647d0a12c633dcdc1e37af07c7 SHA-256: a38e36aa52953613f33295625a32f0c378fdf2b4b51ae9123cfe185a4e08b277
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised WordPress sites or disposable hosting. This suggests the document is designed to redirect users to malicious content, likely for phishing or to download further malware. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5265

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://rakowka.pl/userfiles/file/74555492257.pdf In PDF document text
    • http://studiomalpocher.it/userfiles/files/92748265675.pdfIn PDF document text
    • https://www.alitec.es/js/ckfinder/userfiles/files/50913417169.pdfIn PDF document text
    • http://health-bridge.in/upload/file/sixujesilasalawixatewog.pdfIn PDF document text
    • http://parmalab.it/userfiles/files/tefejalofir.pdfIn PDF document text
    • http://asea-admin.com/_userfiles/file/20210901163109.pdfIn PDF document text
    • https://cometgroupinternational.com/ckeditor/ckfinder/userfiles/files/jikozugupukit.pdfIn PDF document text
    • http://studiofantino.it/userfiles/files/38195240002.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16140811c6f2fa---12415972821.pdfIn PDF document text
    • http://fisioterapiasuzzara.it/userfiles/files/65719128972.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/161346993a4245---nipoduwefasalizeb.pdfIn PDF document text
    • http://energywork.pl/userfiles/file/vuvofokukaxomijenuvipixe.pdfIn PDF document text
    • https://www.sherpachristain.org.np/ckfinder/userfiles/files/14224330872.pdfIn PDF document text
    • http://simonkuehner.de/gfx/userfiles/files/puwutivenufeguforepaxemag.pdfIn PDF document text
    • http://sweepinstyle.com/userfiles/file/47101563406.pdfIn PDF document text
    • http://archi-m.ru/userfiles/file/fesefugukoveze.pdfIn PDF document text
    • http://xn--80aamwn.xn--p1ai/userfiles/file/vojunuponob.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/vnqc55nbpbnr9jm08ufsjo6oi0/fezirulafubij.pdfIn PDF document text
    • http://biplano.eu/userfiles/files/92950388230.pdfIn PDF document text
    • http://clingac.com/d/files/86001525473.pdfIn PDF document text
    • http://ansing.nl/userfiles/file/30679282256.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/38765c06124ce2e56b2dbcf42a207c69/jazunifudeder.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=cellulari+dual+sim+android+umtsPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c5ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5EF 10540 bytes
SHA-256: 916c430579fc81580afd17a01629a3216f5ae86cdc117ac5def728296998c401
font_01_sfnt_off0000dde8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDE8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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