Malicious PDF — malware analysis report

Static analysis result for SHA-256 692aef58031e8ad6…

MALICIOUS

PDF

144.4 KB Created: 2021-06-29 05:26:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4c3609097258724122c29351baf51927 SHA-1: 15f1f243d4fffaaf80a9a4f486691366a692438b SHA-256: 692aef58031e8ad6847b34839b349ff84d73c12f6c3064f701153bd63214ddc6
154 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with numerous links pointing to potentially compromised or disposable hosting sites. The document body is heavily obfuscated and contains no readable content, suggesting it is designed to host links rather than convey information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5507

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://planet-for-events.de/userfiles/file/7433175394.pdf In PDF document text
    • https://liniagdanskzydowo.pl/files/91638323119.pdfIn PDF document text
    • http://fbchitchcock.org/clients/8/8b/8bdff38a390027835eb24981312b950c/File/1471577611.pdfIn PDF document text
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/40bff14a429b5f828743c5b498b7b24a/nogerebotorejovobogonigi.pdfIn PDF document text
    • http://kaies.cn/upfiles/file/memubururofurepafejop.pdfIn PDF document text
    • http://apexibd.com/uploads/fck_uploads/file/nirabadet.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9626ddf3e0---46104730516.pdfIn PDF document text
    • https://triosms.com/userfiles/file/16939398348.pdfIn PDF document text
    • https://gofropack.com/wp-content/plugins/super-forms/uploads/php/files/c091e34dee8db14c5cd033e5ce9eb2fa/63934272917.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/160861dec0f2fc---86710358636.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/27039be4c6cf32a3c3d4b80d2931ccc6/43798834250.pdfIn PDF document text
    • http://vogiantinhmach.com/media/ftp/file/sunomefe.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/41dd2f33262a2eb7374463defcf6533b/leponaximafowujigokapuw.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a640b2dfbaa---7713879161.pdfIn PDF document text
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/893a234d1b206ce693fcb96f89238c2c/83195672933.pdfIn PDF document text
    • http://www.anjhimayath.com/upload/file/24778728597.pdfIn PDF document text
    • https://alianzatours.com/imagenes/file/32108900067.pdfIn PDF document text
    • https://xn----8sbcehyodmtf1czh.xn--p1ai/userfiles/file/zogavor.pdfIn PDF document text
    • http://ashioke.com/images/library/File/pituzake.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160876c2f659e2---31783964143.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160717464915c8---83152545757.pdfIn PDF document text
    • http://accessprecision.com/userfiles/file/19722744293.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6de135128---rofewub.pdfIn PDF document text
    • http://trendybiz.in/usersfiles/file/34371923635.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=high+school+dxd+streaming+vostfrPDF link annotation
    • 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_off00017349.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17349 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00018b5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18B5B 21520 bytes
SHA-256: 580a59dfd66c2092643f5f219e6dbc9cff23167bd99edc3586015f3c791e7ea5
font_02_sfnt_off0001c050.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C050 11084 bytes
SHA-256: 61b42ce72a7fac1929f9c19664c4eb25a646ab9f5bcd52c0825b6e5f4a8280a0