Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed5ca2b9c77b33e1…

MALICIOUS

PDF

80.4 KB Created: 2021-07-21 09:43:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: dcb98460a16feb351ef613c0780bc072 SHA-1: 771e12b9b99097b6657b50c32559aebbd9200679 SHA-256: ed5ca2b9c77b33e1e4254521ee23238846556172d26b94839620a48b7b0a34ec
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 CMS upload directories. The ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggests malicious intent. The primary attack pattern observed is the use of a link farm to direct users to potentially malicious content hosted on compromised websites.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4210

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://tsg-vaganovskoe.ru/ckfinder/userfiles/files/5248106352.pdf In PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/0de126476051c8db356bc635a54c14ed/sanizagatinonibuvidasokis.pdfIn PDF document text
    • https://papiratisk.cz/soubory/21738192849.pdfIn PDF document text
    • http://studiotrusso.it/userfiles/files/siruvirotuvolexikobinok.pdfIn PDF document text
    • http://neoneofitou.com/ckfinder/userfiles/files/fizidibuvufawa.pdfIn PDF document text
    • http://longarmquiltacademy.net/fckeditor/userfiles/file/muleganasom.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16086eed0e82d4---3403216214.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/ddb969dc7be414fd8bde635f395e1e1f/lurapururovorefaso.pdfIn PDF document text
    • http://copy2d.com/ftp/image/file/19136687241.pdfIn PDF document text
    • https://dentalrud.com/userfiles/file/45959213048.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a62993e45f3---38251231368.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608219cb2449c---gegadamifasewud.pdfIn PDF document text
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/cf08845ad66e9f6bd65532a4598d2302/3010995351.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/1df6ehrbtvq8cq0kgri1379es3/gifexu.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160893d40b11c3---topakejeta.pdfIn PDF document text
    • http://loaamtran.vn/files/usersfiles/files/23433501814.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/1609099f8a176d---sabadezam.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/160bebe5380d8b---25677309904.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/30384621975.pdfIn PDF document text
    • https://autoteam.in/ckfinder/userfiles/files/lusajojew.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/99b53a8fa11f1bea595b734d1c366dc7/xuvoxozubopisekuz.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b00b7bc08ae---pitutomi.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16072471d4ce84---fajalusixijavazisuburida.pdfIn PDF document text
    • http://saipanbooking.com/FileData/ckfinder/files/20210612_FE07EC0829B2D9A9.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/d4713c22439c94ae11e9c29372772901/88366524413.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=asura+tale+of+the+vanquished+pdfPDF 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_off0000f4aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010cc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CC1 10888 bytes
SHA-256: f7569101d640c60f4207ab51992be8c889e365bfb8eba0cb823e1dcfcb78a29c