Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1544f1c739b87b1…

MALICIOUS

PDF

70.0 KB Created: 2021-10-03 20:19:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 60edd2f7d487752d06d9059b9e8e87a2 SHA-1: 7ee830b71dcfc1088e0bc0fc4e6369e03c4e0839 SHA-256: e1544f1c739b87b1a66d0a41506650da7fc5eb5fdbfb34a88e7c9d730ed221db
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs that point to various domains, many of which appear to be compromised or disposable hosting. The ClamAV detection and the heuristic firings indicate this is a phishing or malware distribution attempt. The document body is heavily obfuscated and unreadable, suggesting it is not intended for human consumption but rather to host these malicious links.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4326

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://coretry.ru/uplcv?utm_term=ao+smith+power+vent+water+heater+owners+manual PDF link annotation
    • http://royal-pizza.eu/files/file/godusid.pdfIn PDF document text
    • http://metafelix.it/userfiles/files/77538030856.pdfIn PDF document text
    • http://mygiftltd.com/userfiles/file/54954852706.pdfIn PDF document text
    • https://imagebuzz.net/ckfinder/userfiles/files/vixilojavedapeg.pdfIn PDF document text
    • http://longarmacademy.net/fckeditor/userfiles/file/voresurajikitabifane.pdfIn PDF document text
    • https://aadharshilaschool.org/userfiles/file/kibererul.pdfIn PDF document text
    • http://michalpavlicek.com/uploaded/file/19929030582.pdfIn PDF document text
    • https://giverny-bkk.com/upload/files/vitezulamizotevejigexob.pdfIn PDF document text
    • http://gsmontaggi.it/userfiles/files/mijamekepome.pdfIn PDF document text
    • http://arkystudio.eu/userfiles/files/sajaborazoloverorunumumi.pdfIn PDF document text
    • http://dakmet.pl/upload/58978946285.pdfIn PDF document text
    • https://padservhosting.com/userfiles/file/51558615012.pdfIn PDF document text
    • http://rkenterprisesonline.com/FCKeditor/file/tegotunuxuxatuzoseru.pdfIn PDF document text
    • http://xn--franzsischebulldoggen-lec.eu/userfiles/file/zugedosivalenedasala.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/1e44fda56f9ad7655064f2a08ef4178c/sologejenimunuboronebilud.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/c2f2a4ff91aecbf6da6adbe667aa2eeb/86979991006.pdfIn PDF document text
    • http://qhzs88.com/admin/fckeditor_upfiles/file/2021090904432780554.pdfIn PDF document text
    • http://hulstcustoms.ru/uploads/files/1115994318.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613d7b1597a94---5488668829.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/br5rbe05odb0om3ph42umbuf2p/dudibemoniz.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b43e49f9c7---70977425834.pdfIn PDF document text
    • http://anais.terminarz.online/kosmetyczka/krakow/files/89717620637.pdfIn PDF document text
    • https://adurucui.com/ckfinder/files/41994708931.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_off0000c1fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1FD 18900 bytes
SHA-256: 6c32c90aaaabf664ea5060dfad6d8fcfe456ac053ecd974c9c0ce944c45bce4a
font_01_sfnt_off0000f313.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF313 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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