Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c8868dad16c8225…

MALICIOUS

PDF

85.4 KB Created: 2021-07-21 01:18:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0896a892957a15604b3556f5f37e4466 SHA-1: d7f5051dc7f447f82b7f450748e8aa75ab352728 SHA-256: 1c8868dad16c8225d2d55089220b361f4b9524ccf186460fcfc40ba58702ded6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a link farm directing users to multiple potentially compromised WordPress upload directories and other disposable hosting sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to phish users or deliver a second-stage payload. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://qytbearing.com/upfile/file/98654348753.pdf
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/cgk2ui4i4ohahppngr5gsbhgsn/49552256210.pdf
    • http://stuarteisbrucklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/49874432953.pdf
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160761a9845e25---6070462166.pdf
    • https://mecaniquekd.ca/upload/file/8290839690.pdf
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a06c2c495a6---muneboniselijunaleri.pdf
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609466caac26b---fumaripafududate.pdf
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160bbabdf68002---15494697018.pdf
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/ndp6r8u7r39f070gagcj5neek6/72200373575.pdf
    • http://polloricowings.com/uploads/files/belapibawodevaniga.pdf
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/dd9834d4ba123cb73e67ac78a58e0921/lawoweji.pdf
    • https://salvatoredivilio.it/userfiles/file/72551600319.pdf
    • https://tatsolarlight.com/uploads/files/3666326801.pdf
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c8a051b06dd---regojirinimoron.pdf
    • https://wkd-uk.com/wp-content/plugins/super-forms/uploads/php/files/b31e3a22dd0dd4b5248098be2ce23129/xijisetunof.pdf
    • http://teechart.com/uploads/images/files/sesuza.pdf
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/jj56go4lvlcmlrmgk6h32g4id5/zefapex.pdf
    • http://skupka23.ru/upload/m/3714871415.pdf
    • http://dobryremont.pl/ebobas/portal/app/webroot/img/tmp/file/16206178383336.pdf
    • https://marblobath.com/app/webroot/img/files/nedin.pdf
    • https://ols.lighting/wp-content/plugins/super-forms/uploads/php/files/4759d963d30955ee8638cc592f693359/51347280116.pdf
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609bf7ea9f009---zitamuzeferatiranaz.pdf
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/160bbe40d589eb---393069488.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=speed+distance+time+tests
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ecac.bin
ecd24acf000b348210ab66be57cfd7b1eb2e5ce898f82d00b3967bd7d489b66d
pdf-font-stream PDF embedded font (sfnt) at offset 0xECAC 10484 bytes
font_01_sfnt_off00010476.bin
d6e173dd2664e0d3910d735874137cf37e89aba2bbb6b3ae5ebd283778832c95
pdf-font-stream PDF embedded font (sfnt) at offset 0x10476 16948 bytes
font_02_sfnt_off00013089.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13089 16792 bytes