Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ebba0f160f993d7…

MALICIOUS

PDF

87.8 KB Created: 2021-06-27 01:20:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 537425c2daa0c3bd822a061ad9581179 SHA-1: fbe6d58926c0f38fbfbfa88bef48b3222832db6d SHA-256: 4ebba0f160f993d756d202e7ced72500cff7d45b64223cc72b8725265809925d
196 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites, 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. The presence of 'cmdmrkjrn' in the document text, alongside the URL structure, suggests an attempt to disguise or obfuscate malicious commands.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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 https://chcial.ru/uplcv?utm_term=long+haired+tabby+cat+for+sale
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/5d77c6d8f1d0fc96a25ec225093a6774/42278670928.pdf
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1a287d0952---fuzugegabelunuf.pdf
    • http://china-baby-clothes.com/d/files/gidakaxo.pdf
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/9vfmvps2frd05gu0loi1v4tihr/dexajunenuvuxurafa.pdf
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/160c95dd7baab8---72043750242.pdf
    • http://mygotour.com/FileData/ckfinder/files/20210614_CD0A19E1A84B8F98.pdf
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/160c728bd22b12---2294344173.pdf
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c83c01a299---69788046607.pdf
    • https://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/ehdk8s9cgm48ug5rr7r43mc0al/muzaginowexaliboj.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d95df4d116---79256706187.pdf
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16085e0dec4cc0---74096552764.pdf
    • http://17njl.com/userfiles/files/53803065466.pdf
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b7305acfc7e---35276815540.pdf
    • http://ahs1978hounds.com/clients/0/09/09313dc2b2b2138818c22350edca9cf7/File/30125791232.pdf
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/812d8dcee31beba8ec067b3e42ffef55/rozomujezusekapu.pdf
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4939ec5ddc---21046156067.pdf
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607dd9048ea8c---10912438461.pdf
    • http://pvhs1967.com/clients/a/aa/aa78cb05297cd93d8a9ab6bd1eb8a3c4/File/nunukonogojetusi.pdf
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160849fa9b5716---12090485280.pdf
    • http://aldara-latinoamerica.com/userfiles/file/bijinugomizavupeb.pdf
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c7009c06ef2---51703405361.pdf
    • https://icbacademy.com/upload/files/52665282066.pdf
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/c1hoq89cp4jfjng2cmdmrkjrn1/52298660589.pdf
    • http://mkconline.com/landmark/ckfinder/userfiles/files/kexirologenimenuvoruwimaz.pdf
    • 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_off0000f1f4.bin
8d4fe201fd4a0b85e84aa164383ba6676ad91b00b52204eee9587fdf155c163d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F4 17320 bytes
font_01_sfnt_off00011f12.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11F12 16792 bytes
font_02_sfnt_off00013729.bin
f48b70f5e3105c23fc42e673660b1dfe119348efa1175d004525ca6ecd7d0ea2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13729 10964 bytes

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