Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a30c34884f38d17…

MALICIOUS

PDF

54.0 KB Created: 2021-09-27 00:07:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0c404b129a416466c5d9e3767efd58c9 SHA-1: 71553a8b056938d26623d8f052028a45a81d26b1 SHA-256: 1a30c34884f38d17505613c9145f4ac47aff5a496919c04f56519ac8abac808c
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as 'Pdf.Phishing.Trojan'. It contains an embedded JavaScript stream and numerous external URIs, many of which are part of a link farm hosted on disposable or compromised domains. These links likely serve as lures to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8235

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.
  • 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://philabc.ru/uplcv?utm_term=dragon+ball+fierce+fighting+4+unblocked PDF link annotation
    • http://ssp.by/var/upload/58847138551.pdfIn PDF document text
    • https://mangallagn.com/images/file/pijurutotef.pdfIn PDF document text
    • http://ttccid.com/userfiles/file/dopikadopipidepa.pdfIn PDF document text
    • http://viacaosaopedro.com/www/js/ckfinder/userfiles/files/41170458166.pdfIn PDF document text
    • https://floraplant.gr/FCKeditor/userimages/file/vewakurujofojebeloki.pdfIn PDF document text
    • https://thebillionbottom.com/business_school/uploads/file/wotezawavanopilawaro.pdfIn PDF document text
    • http://fsnmmaterials.com/UPFILE/userfiles/files/tobomokakoju.pdfIn PDF document text
    • https://lesrimaudieres.com/images/uploads/file/bivigafuxerixinebeve.pdfIn PDF document text
    • https://xebecdesign.com/xebec/userfiles/file/jokevavoxi.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/l1nu2o3e59nm04i2fjuvuqi6he/zazeninixogeb.pdfIn PDF document text
    • http://parikshitconstruction.com/uploads/vitaxutigujituvawewelaxaz.pdfIn PDF document text
    • http://gnatowski.pl/attachments/file/74490307456.pdfIn PDF document text
    • https://armenia4d.com/contents/files/lisabobabitasufasukexer.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/161430d0416a98---13424737601.pdfIn PDF document text
    • https://lean-ds.com/upload/editor/file/35977859606.pdfIn PDF document text
    • http://klick-tipp.at/ckfinder/userfiles/publics/files/sebejesabadobimewuja.pdfIn PDF document text
    • http://gezond-trakteren.nl/kasteel-doornenburg-img/bestandenfile/28061433474.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/8383b85091511940b4f604efba5b145b/13122339907.pdfIn PDF document text
    • http://hzqljsj.com/images/upload/File/nowukukaliporaremaki.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614cbcc7e5d57---xikalogaluvekakuvitaroz.pdfIn PDF document text
    • http://studiosantomauro.it/userfiles/files/20987329042.pdfIn PDF document text
    • http://spokoino.ru/i/upload/files/20304525861.pdfIn PDF document text
    • https://stancijanegrin.com/UserFiles/files/58338155435.pdfIn PDF document text
    • http://studiolorenzoni.eu/userfiles/files/55133406869.pdfIn PDF document text
    • http://termosystem.pl/userfiles/file/vijizatid.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b7c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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