Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8c4746f650e26bf…

MALICIOUS

PDF

63.7 KB Created: 2021-09-24 19:01:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: bc79187c570777d796966add818cc938 SHA-1: 10ecf37c045152d466dc7518fc9c28cd0bd829ea SHA-256: e8c4746f650e26bf629b6c0875cbf8c719836406db23b3e3a524fb643fc22294
124 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan. Static analysis revealed it functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting. These links likely lead to phishing pages or further malware downloads, aligning with a common tactic for distributing malicious content via seemingly innocuous documents.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3800

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://huntic.ru/uplcv?utm_term=register+and+login+in+android+studio PDF link annotation
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136392484dce---kuxejelidax.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613dff36e69f9---balakizuwijelesunitu.pdfIn PDF document text
    • http://wwsm-us.com/files/file/25341302385.pdfIn PDF document text
    • http://year-c.com/upload_fck/file/2021-9-6/20210906201015531431.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141b06daa192---kunodazubozurep.pdfIn PDF document text
    • https://www.pirkitpadangas.lt/ckfinder/userfiles/files/54887928472.pdfIn PDF document text
    • http://zeci.nl/im/image/sofarasib.pdfIn PDF document text
    • http://gesundimjob.at/images/content/files/3836981533.pdfIn PDF document text
    • http://villacappuccina.com/userfiles/files/16535883881.pdfIn PDF document text
    • http://teamhead.net/userfiles/file/saximenabijexus.pdfIn PDF document text
    • http://swiftnb.com/ckfinder/userfiles/files/44482956964.pdfIn PDF document text
    • http://mega-treid.com/userfiles/files/zilutuzoxuzinetesuvoluji.pdfIn PDF document text
    • http://ersatzmonitor.de/userfiles/file/7252306006.pdfIn PDF document text
    • http://spadhotel.com/basefile/spadhotelcom/files/78269332929.pdfIn PDF document text
    • https://lrsdev.com/userfiles/file/94213637772.pdfIn PDF document text
    • http://playitdirect.ca/ckfinder/uploadfiles/files/81983049427.pdfIn PDF document text
    • https://tamphuctriland.vn/upload/files/dalopevavugejerali.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/16147a8ae86351---13545813265.pdfIn PDF document text
    • https://dutchhaves.com/uploads/files/202109201423453610.pdfIn PDF document text
    • http://josephfellerlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/56973389912.pdfIn PDF document text
    • http://marktoby.com/akram/know_news/admin/userfiles/file/21234230473.pdfIn PDF document text
    • http://eatatrudy.com/uploads/files/97404477401.pdfIn PDF document text
    • http://labradory.pl/file/wagabaxotefiwejupatosot.pdfIn PDF document text
    • http://baschin-heizung.de/meineBilderAlbertGrundschule/file/42090472016.pdfIn PDF document text
    • https://meesens.be/KrMee/Tekstverwerker/nizadadowewi.pdfIn PDF document text
    • https://eletvital.hu/uploads/files/7071831273.pdfIn PDF document text
    • http://sunnyten.net/userData/board/file/66963828093.pdfIn PDF document text
    • 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_off0000be31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE31 10568 bytes
SHA-256: df9e2dc4f214a35980ec5d3b9b1158c918ac1d9c930072c99651531a4b5eb6e7
font_01_sfnt_off0000d634.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD634 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1