Malicious PDF — malware analysis report

Static analysis result for SHA-256 850609ce7bc05329…

MALICIOUS

PDF

70.7 KB Created: 2021-09-23 15:44:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9ca06fe7cfcee2113d9aa4fbca57adfb SHA-1: 6dcd9c6017a0029b349b107e23accda5797e61ee SHA-256: 850609ce7bc053299f0bc28ac0f7d495c609adc2c815ddbbd80386375f2845a9
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous external links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. The presence of external URIs and the overall structure indicate a phishing or malware distribution attempt, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6717

Heuristics 5

  • 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
  • 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://queure.ru/uplcv?utm_term=download+apk+mod+lightroom+full+preset PDF link annotation
    • http://otoozevran.com/resimler/files/gabajizisuxom.pdfIn PDF document text
    • http://kammatrans.com/userfiles/files/21559691186.pdfIn PDF document text
    • https://jotekonybakterium.hu/userfiles/files/xugadinodotavajaja.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614044b38f6c2---bujimulesuroxafopesiz.pdfIn PDF document text
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/6ga0fmqdni3iirs2adibp8n9h8ctun7q/pemiwero.pdfIn PDF document text
    • http://exteractif.fr/pictures/2/67592126285.pdfIn PDF document text
    • http://logicparcel.net/uploadsEditorfile/piranoso.pdfIn PDF document text
    • https://taiwan-tiaya.com/upload/tiaya_official/files/wupamego.pdfIn PDF document text
    • http://www.deep2001.com/images/library/File/28181885660.pdfIn PDF document text
    • http://parfumerieindex.nl/images/uploads/3242250055.pdfIn PDF document text
    • https://southafricapools.com/contents/files/15962736280.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/zutulugirokiwagux.pdfIn PDF document text
    • http://anindecor.pl/files/file/5566231071.pdfIn PDF document text
    • http://swvocal.com/data/se2/file/govuzelozeluputotez.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/16149556156f77---74663656337.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146cb58839c5---95250549201.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1612f0570b2fb6---kuvemibolojudubikixi.pdfIn PDF document text
    • http://metamorfozyayincilik.com/userfiles/file/88832001325.pdfIn PDF document text
    • http://alpha-cp.com/userfiles/file/gawelunakolofe.pdfIn PDF document text
    • https://hankilfood.com/userfiles/file/20210914154842.pdfIn PDF document text
    • https://hbphoto.ca/resimler/files/vobivevovilivevawuvotok.pdfIn PDF document text
    • http://chornakorn-packing.com/ckfinder/userfiles/files/barunisuro.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/e8074b31ecbed75fc4783cd3658c698d/59448221842.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/93423d80b69f2a4b3dfbc266bcb253b0/83450383488.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_off0000ebf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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