Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa539efc681ee4fd…

MALICIOUS

PDF

79.3 KB Created: 2021-08-13 02:52:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 69b056fcd29328aaa4302a2cf00b5559 SHA-1: f15956d22e25cff7dd98849c265b6f9e4de1ff67 SHA-256: aa539efc681ee4fd37b8468dfc949179f03cb83dd5882fbfa0449a341fb8022e
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm pointing to numerous domains, several of which are hosted on compromised CMS platforms, indicating a potential phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to exploiting users through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9080

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://almoheetmanpower.com/public_html/userfiles/file/zunit.pdf In PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160983d2a12305---fiseloxuzonuxitobugek.pdfIn PDF document text
    • https://folklorebridge.eu/uploads/pictures/files/79487798501.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/kisewoziva.pdfIn PDF document text
    • https://bnovum.hu/downloads/90330482349.pdfIn PDF document text
    • http://kaushalacademy.org/ckfinder/userfiles/files/80023416826.pdfIn PDF document text
    • https://briljant-maleri.se/UserFiles/files/3833893463.pdfIn PDF document text
    • http://evevoyance.fr/adh/.-/file/guwomezesilenupozewiza.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/sipolukufevu.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/c395a87d97465a165934255f46e598fb/kidexuxavozedavo.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160924ee0cce08---zurifuloxibadix.pdfIn PDF document text
    • https://zivotzaokny.eu/res/file/wigulober.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1610db7c629e7b---75607050863.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16081e7c481051---41612571659.pdfIn PDF document text
    • https://restavracia02.com/userfiles/file/67577819257.pdfIn PDF document text
    • https://jgmurphy.com/wp-content/plugins/super-forms/uploads/php/files/4224f796343746cdd33733cd5bd9405d/bobawunolakido.pdfIn PDF document text
    • https://666666.vn/upload/fck/file/milerifore.pdfIn PDF document text
    • http://nedirajtebosnu.net/userfiles/file/pufulelijuk.pdfIn PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/9chsgcafquiup4tg00e9ojbhvc/57838438935.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/39991796010.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d9a81a3d94---kedotegirunever.pdfIn PDF document text
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070b0f91a753---xawefofigudibutub.pdfIn PDF document text
    • http://michaelwilliamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/48032350209.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609e84ff54186---juxanarapuf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=medical+terminology+pdf+2020+freePDF 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_off0000f95a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF95A 16692 bytes
SHA-256: 72bac347e183dc070cb2af5a49b561025988795864a3f22b06aaf64bb5b5f063
font_01_sfnt_off000124b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124B5 11144 bytes
SHA-256: b7593d2bcb88c5e96d9e8cd172ee41427b4681c8973c2cea3ca8c5808e1d8ac7

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