Malicious PDF — malware analysis report

Static analysis result for SHA-256 6baedc78aaf813fb…

MALICIOUS

PDF

70.7 KB Created: 2021-09-12 06:02:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0dd367c7a372cbcd2a296dd1609196ec SHA-1: 221ec0c90a7292f849c3d43a720a91144a34a9b9 SHA-256: 6baedc78aaf813fbe66e8a445b36780e36f0ae94acc150ec8496beb52c8994a6
132 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or redirecting users. The presence of a link farm pointing to multiple distinct hosts, some of which are hosted on compromised CMS upload storage, strongly suggests a phishing or malware distribution attempt. The ClamAV detection further confirms its malicious nature.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4393

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://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/333375b0920058a8a05eceddd5800eb9/74999691175.pdf In PDF document text
    • http://aquamedia.cn/ckfinder/userfiles/files/vamulamulemujipifod.pdfIn PDF document text
    • http://herningbadintra.dk/app/webroot/upload/files/26448518259.pdfIn PDF document text
    • https://keiba-like.biz/js/ckfinder/userfiles/files/27570312908.pdfIn PDF document text
    • http://xn----ctbguteehkho5h.xn--p1ai/ckfinder/userfiles/files/31436173000.pdfIn PDF document text
    • https://pima-alarms.net/slicice/file/laxivituzoxuxotivexusuko.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/078f9a5c94bd586d502e2ba242492142/dizozarezonosa.pdfIn PDF document text
    • http://www.hangmandigital.com/files/file/43548406129.pdfIn PDF document text
    • http://prograsifkalip.com/files/zipoluluvosakakisu.pdfIn PDF document text
    • http://kfnmdg.com/upfolder/e/files/20210904061553.pdfIn PDF document text
    • https://path.mn/userfiles/files/wipujegepufuk.pdfIn PDF document text
    • http://jshanwoo.com/ckfinder/userfiles/files/pidivifuridizowuloxezured.pdfIn PDF document text
    • http://ecoaga.com/documentos/file/fitazipebejopobubugobeko.pdfIn PDF document text
    • https://purefeeling8.com/data/file/73945002639.pdfIn PDF document text
    • https://krossi.ru/images/content/files/lutamagor.pdfIn PDF document text
    • http://nfc.soo.jp/file/14395522968.pdfIn PDF document text
    • https://ncltandatbar.com/home/ncltandat/public_html/dowalumniusa/ckfinder/userfiles/files/xewoligiga.pdfIn PDF document text
    • https://butagallery.com/userfiles/files/gikugibepoduxo.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/39004116314.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1612ea45762a52---21752703814.pdfIn PDF document text
    • https://vibangnhadat.com/uploads/files/luzivavanafuve.pdfIn PDF document text
    • http://yourtruck.be/upload/ckeditor/file/jixizafidulumaxugoganexap.pdfIn PDF document text
    • https://gotoko.com/cmsv2/upload/files/93409257598.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=download+hidex+calculatorPDF 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_off0000e882.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE882 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010099.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10099 10588 bytes
SHA-256: 08b5bfda63aee44ee542b7906777ed7a265164dde369840e465eb6156bdd35fd

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