Malicious PDF — malware analysis report

Static analysis result for SHA-256 63689b73931e811c…

MALICIOUS

PDF

91.6 KB Created: 2021-07-23 04:19:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2a76c22783c90bede49398fd2dd4cd05 SHA-1: 832d1f54ec19177a60bffa0c3fe61c59252c88a1 SHA-256: 63689b73931e811c5d833223625a6e6f9e57e55a4f6cfbd1161c49e71f236f4a
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised CMS uploads and disposable hosting domains, a common tactic for distributing malicious content or conducting phishing. The ClamAV detection and ML classifier strongly indicate malicious intent. The file's structure and link farm nature suggest it's designed to lure users to external, untrusted resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://sbairs.com/datas/files/zozitejixifurugages.pdf
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/d5ae9f8384fed8cc774e2dcdf3587045/forusam.pdf
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/cfdd1d2e8e4a18329336ac86acff38f1/75331790831.pdf
    • https://xanbiente.de/userfiles/file/sugelukulapabubogujirunaw.pdf
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/6535f4bf6e63543efdd56901ffcdff61/netagoda.pdf
    • http://unicaconsultoriarh.com/images/files/28888446737.pdf
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/87ca2356cbb1c02fd6a01e281207cb9e/piladukebipetabawokub.pdf
    • http://angarakshaksecurity.com/userfiles/file/jisuzetigafotijibok.pdf
    • http://mpti.ru/userfiles/file/vuziroxe.pdf
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/8ecf5598fceea4ccd269a4295924f9a2/26988410330.pdf
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/e24ribitl7d12v7m310gmhivll/lelizim.pdf
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/09f3666b58b532d364541534940acd63/delobamek.pdf
    • https://www.varishastalari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160875c5e9b946---75375323755.pdf
    • http://cafesezony.ru/fck_editor_files/files/7754131053.pdf
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3f4792b7a---vuzejapeliwurukubirinu.pdf
    • http://innotec-industrie.be/userfiles/file/fuzetoborafifom.pdf
    • http://hzdsbg.com/uploadfile/1621381575.pdf
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160776737c69f4---24891958022.pdf
    • http://ptairsupply.com/userfiles/file/21108883007.pdf
    • http://fratellilongoni.com/userfiles/files/33661909637.pdf
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c389b3f167---21763840745.pdf
    • https://xn--arbeitskndigungsrecht-best-5zc.de/userfiles/file/xofovijigorudaxavob.pdf
    • http://brkvinc.com/userfiles/file/limujudoxowexopajumif.pdf
    • http://www.chatanakonci.cz/userfiles/file/76343561846.pdf
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3f67db2488---60535418712.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=star+wars+rogue+squadron+4
    • 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_off0000fb40.bin
19e7218b972956799e3f8828d4990d25e1a8dd4f6413e1535e42a5cc3de817e2
pdf-font-stream PDF embedded font (sfnt) at offset 0xFB40 20232 bytes
font_01_sfnt_off00012f0d.bin
bc53e02a377cba42110039d1562d36b9d956fb285f0db646cf700ec5e8ac3665
pdf-font-stream PDF embedded font (sfnt) at offset 0x12F0D 10772 bytes
font_02_sfnt_off00014793.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14793 16792 bytes