Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a96dd115738a8d9…

MALICIOUS

PDF

72.0 KB Created: 2021-09-16 19:12:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 11efc65161152fa64295138556d11512 SHA-1: b6488e8604953c29647773e474e4119a50daf065 SHA-256: 4a96dd115738a8d9a59501e7df2e06019a22d97b5dd5dede7a713d855b2c91f3
124 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites and are structured as a link farm. The ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggests a malicious intent, likely to lure users to phishing sites or download further malware. The presence of multiple distinct hosts and the use of UTM parameters in some URLs indicate a coordinated effort to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.2639

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://krisoc.ru/uplcv?utm_term=index+of+movies+apk PDF link annotation
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/161375b1b89631---36091228359.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16142719e443ad---12954013065.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/23435830820.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613e4a7e935e1---4281791867.pdfIn PDF document text
    • http://szyoujin.com/UploadFile/file/20210905220140120.pdfIn PDF document text
    • https://biocoop.legreniervert.fr/ckfinder/userfiles/files/7399608126.pdfIn PDF document text
    • https://dienmayminhchau.vn/uploads/news_file/pedaxagi.pdfIn PDF document text
    • http://eaupureinternational.com/userfiles/file/fomagarikode.pdfIn PDF document text
    • http://aodaiminhhanh.com/app/webroot/uploads/files/36894425252.pdfIn PDF document text
    • http://taiwanquinoafamily.com/shopadmin/upload/files/57811088287.pdfIn PDF document text
    • http://evola.it/userfiles/files/mofatenuwirisokufajuput.pdfIn PDF document text
    • https://tagoproperties.com/ckfinder/userfiles/files/43323842872.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/161392c7371009---16850910147.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/16141d9317e3da---kuzawasibuzid.pdfIn PDF document text
    • https://taipeitccia.org/CKEdit/upload/files/pirofetatinevelu.pdfIn PDF document text
    • https://www.la-providence-ehpad.fr/ckfinder/userfiles/files/givusawuwugoxowenazegegem.pdfIn PDF document text
    • http://chaodontuonglai.vn/uploads/ck_upload/files/pojenolizu.pdfIn PDF document text
    • https://al-farh-iq.com/upload/userfiles/file/64524579424.pdfIn PDF document text
    • http://bio86.fr/userfiles/fichiers/25425050869.pdfIn PDF document text
    • http://trungnguyenjsc.vn/uploads/image/files/zukib.pdfIn PDF document text
    • http://evaemlak.com/userfiles/file///48848552710.pdfIn PDF document text
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/baxufilipinateju.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/1613fcc167c72c---xokodifoxafe.pdfIn PDF document text
    • http://ntouioc.ntou.edu.tw/ckfinder/userfiles/files/nawixabapalofobedas.pdfIn PDF document text
    • http://bassbasement.org/userfiles/file/23068599389.pdfIn PDF document text
    • https://samsungdvm.net/upload/ckfinder/files/7185013043.pdfIn PDF document text
    • 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_off0000c5da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ddf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDF1 10628 bytes
SHA-256: aab54bda12a34b0bfb3b6f03aefee9e8502b65514364d96cf13f8b0a9868d5b6
font_02_sfnt_off0000f646.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF646 17260 bytes
SHA-256: 46e046d48a5dfdeca1955e572ba75c95f16c8deb03f015fa08ac170887cfeaa4