Malicious PDF — malware analysis report

Static analysis result for SHA-256 0191e52ec26a0b16…

MALICIOUS

PDF

110.0 KB Created: 2021-06-11 23:10:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: bde5c5650e637120208fbc97eb67503f SHA-1: 416b81dfc96895ecc8a5735fe1e05c81e895815d SHA-256: 0191e52ec26a0b1624b12565608c5e5aeb98957371385a5e644e15360193ba99
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://medvor.ru/uplcv?utm_term=gun+shoot+war+mod+apk PDF link annotation
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f4c8a3e36b---rozusu.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a43aa1b2868---forilematuputofe.pdfIn PDF document text
    • https://communeouchamps.fr/userfiles/file/10693976737.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/i6tbvl4hrgoci6mgcodjk8k1l5/27135279843.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/68447049431.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a9f7b0f3898---zelelaliguvad.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607d731499d25---nadeboko.pdfIn PDF document text
    • http://austria-ex.com/images/blog//file/32060468536.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160abc1c384be3---55630108828.pdfIn PDF document text
    • http://anandamsanyal.com/userfiles/file/wulijabir.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/d2e51d421cdc2f3068f194bd3c20b333/zifatugetin.pdfIn PDF document text
    • http://abwmountvernon.com/uploads/files/99352405750.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/t6qqo9qgl53a6ctetr3u3beurh/7649151309.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160716a3b2703c---95287966869.pdfIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://www.gnu.org/licenses/gpl.htmlIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000110ab.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x110AB 15492 bytes
SHA-256: 01718459e0dea381e2354b811a88ddeba3353f2ecc55ed892b74193821183651
stream_006_off0001688d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1688D 29004 bytes
SHA-256: 6e8a7023800ffff955ad33efd7b4c3d17d24898b794aeb07c06a246f760c5b71
font_00_sfnt_off0000f55d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF55D 2880 bytes
SHA-256: aff11289bf87f92bc53c0e2abc335208e29b6db8a954e82fd0a5595ffa95d344
font_01_sfnt_off0000ff9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF9B 5072 bytes
SHA-256: b9a7a7031558635787dd491be3e8b0b37a2338fd15def547bf96c4d58989ddf0
font_03_sfnt_off00013b6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B6D 14336 bytes
SHA-256: 4c63c3c2f34114224cfa899cc6a7912e71db7af9dfb5acd5c175a6b2a5219d4e
font_05_sfnt_off00019c22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19C22 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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