Malicious PDF — malware analysis report

Static analysis result for SHA-256 f947af92a5035aa9…

MALICIOUS

PDF

86.3 KB Created: 2021-06-26 01:18:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c5722edb1310fa6ec84380235ab09131 SHA-1: 05294727bdb2e60d220428b5343475abf964e961 SHA-256: f947af92a5035aa92675b3b089df09b4bfb799de1f7d01415ca8254a02235433
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites and other disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and embedded URLs are sufficient to infer the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607d54a64bf88---59272488221.pdf
    • https://xetnghiemadndanang.com/upload/userfiles/files/rifoverapokarewiputu.pdf
    • https://kham.vn/userfiles/file/kimafesutonetugir.pdf
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091ebaa8e464---84100806531.pdf
    • http://dobryremont.pl/ebobas/portal/app/webroot/img/tmp/file/16240981841193.pdf
    • http://apsencollege.org/test/fckeditor/file/wokodugarikilafitu.pdf
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606eb8f7d71ad---wavipe.pdf
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1608c001703aa5---vaxenefinemasebakojo.pdf
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab4f64c9647---11299012687.pdf
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/e7f0c9473129de5b0750b0562bdd4733/43291027138.pdf
    • http://dezmaster.com/userfiles/file/81405274133.pdf
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/290k2fstv4rp55h3pcbq1ikse5/51576463626.pdf
    • http://hoitruyengiaocodocvietnam.com/uploads/image/files/49881969176.pdf
    • https://pelicanfinancialnetwork.com/ckfinder/userfiles/files/wadufudukusilalovowo.pdf
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/c1900a09c8c5f97b0eb9e93c39f1c9d8/63165034780.pdf
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/930ec81f90fbbc06028a244eef55481e/69391020689.pdf
    • http://wagnerpc.com/userfiles/files/patukiw.pdf
    • https://conexus-study-abroad-travel.com/ckfinder/userfiles/file/26308628529.pdf
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/cf896285ed662732f6e7a4d2e29df335/norifo.pdf
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/49f1eae2a6c275da1d829ceebc18df3b/53040308554.pdf
    • https://taiwancy.com/app/webroot/userfiles/files/limaxalov.pdf
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/ef734ab77d4675a3aa6c6803bf842e23/kixutujarepure.pdf
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/jpfpcqveb5rmb8qct6hscqr2tp/70889700108.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=ariana+grande+almost+is+never+enough+chord
    • 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_off0000e8d2.bin
34ce6fd7e88beed65c0b80aedadd6af72e6c46a7e283b30fee6e0262c184a86d
pdf-font-stream PDF embedded font (sfnt) at offset 0xE8D2 18248 bytes
font_01_sfnt_off0001189a.bin
7c6660c4bd64016d9b86b55bd8a97bbd87082eb57cca650cc9cc8c71becf84ca
pdf-font-stream PDF embedded font (sfnt) at offset 0x1189A 10964 bytes
font_02_sfnt_off000131b0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x131B0 16792 bytes