Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cd9da1c52cb98bf…

MALICIOUS

PDF

97.1 KB Created: 2021-09-18 21:47:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 6e5083c576132e6ad6cc3b02f7d3e547 SHA-1: 03a58bdd6224b261544ceffdd180f7fddac10712 SHA-256: 5cd9da1c52cb98bf435f6fe2a1ee1b397fd00063210663edefcfc5b478d246bc
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file is identified as malicious by ClamAV with a 'Pdf.Phishing.Trojan' signature. Static analysis reveals it functions as a link farm, directing users to multiple compromised or disposable hosting domains. The embedded URLs and the heuristic firings strongly suggest an intent to redirect users to malicious content, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3615

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 http://www.aamuhsv-madisonalumni.org/files/files/56705336591.pdf In PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16134fa421a7a3---68289658632.pdfIn PDF document text
    • http://chocoenglish.com/_UploadFile/Images/file/43323873062.pdfIn PDF document text
    • http://abwcoliseum.com/uploads/files/fomimibotunubu.pdfIn PDF document text
    • https://smshealthcareservices.com/ckfinder/userfiles/files/sevunubetisinirezujisezas.pdfIn PDF document text
    • http://laulumaja.fi/ckfinder/userfiles/files/88646514350.pdfIn PDF document text
    • http://glassick.com/userfiles/file/galaxinawiboniwup.pdfIn PDF document text
    • https://ketdoanbus.com/webroot/img/files/tesagesatixazaronaxuleg.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/b8b6036641395d8183f946141f86356c/tumanesezemazajerugu.pdfIn PDF document text
    • http://studiofapas.it/userfiles/files/30908061235.pdfIn PDF document text
    • http://www.kizkulesikizogrenciyurdu.com/public/ckfinderuploads/files/naxowarajabewo.pdfIn PDF document text
    • http://marchmontnews.com/imgs/file/73707807596.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613005592e40e---poponusi.pdfIn PDF document text
    • http://neza.cz/UserFiles/File/temokukuginidefixegiwisew.pdfIn PDF document text
    • http://svsteinfurth.de/radsportfiles/file/jemowapov.pdfIn PDF document text
    • https://tsafar.ir/basefile/tsafarir/files/99121584165.pdfIn PDF document text
    • http://russkiivopros.com/images/FCKeditor/file/dujigokinerib.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/16132a5d13d396---jomakizisu.pdfIn PDF document text
    • http://naasschoolofmotoring.ie/fckeditor/userfiles/file/vuzipese.pdfIn PDF document text
    • https://www.jnvhardoi.org/ckfinder/userfiles/files/lawodopuzanidagagunuja.pdfIn PDF document text
    • http://heorungminhphat.com/luutru/files/rozabufuvufufaj.pdfIn PDF document text
    • http://tg-focus.ru/userfiles/files/nenigedakim.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=pixel+art+wallpapers+androidPDF link annotation
    • 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_off00012305.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12305 19324 bytes
SHA-256: d7bca3e7ba959457220b82e4d35359e652db4a4135c2fdac9cb1bea025f24b47
font_01_sfnt_off00015643.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15643 10576 bytes
SHA-256: ee02f70122f59c976935ab781de0f69e70c03196666fa857678cc26fcfb0e353
font_02_sfnt_off00016e9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16E9B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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