Malicious PDF — malware analysis report

Static analysis result for SHA-256 dec09c6e5c3f420e…

MALICIOUS

PDF

93.5 KB Created: 2021-06-30 07:53:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 2527a3be2a2f8a189031c9333fcf4f51 SHA-1: 1f1a5a43ad042825f068de38411568982c238000 SHA-256: dec09c6e5c3f420ee331c93a76ec1e57c61fe35af0caefb5af6f60ac1a6676a3
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains a link farm with numerous URLs pointing to compromised WordPress sites, likely intended to lure users to malicious content. The presence of multiple distinct hosts and the use of 'utm_term' parameters suggest an attempt to obscure the final destination and potentially engage in SEO manipulation for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

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://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/s4248s6c3d158c1esnd2icr2lc/96448080702.pdf In PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1607abc2d56112---lonivoxomumaxozexaligeja.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/1608850df03b4a---3613251409.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609796ed979c7---ziginenagerudavupig.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0c31983d8b---xonalaxo.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a976f169021---jolugerozizabumesifop.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16072547b9e907---niposipakaxawuzag.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/20215146953057.pdfIn PDF document text
    • http://erictex.com/ufiles/files/ditinokemabotokure.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/6020ddaac04dc8e02cf3dc72e44a2b2f/xokibelebiduboroxug.pdfIn PDF document text
    • https://www.groupenahno.com/wp-content/plugins/super-forms/uploads/php/files/8rc7fgjf7lsgpmqoovlqbhb5kq/mopedomubapolivuzajax.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad8fd054eef---wakor.pdfIn PDF document text
    • http://chpcentre.com/files/file/foxomejop.pdfIn PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/20b15db21389b97c88761068c0b58bd2/70584212904.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/d0f6e80262a5a5bd490cc1655ba7746c/luleboratunosufovuri.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/d7685e915651173155a5dd6fab33a2a8/16027195459.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608be24ec0a59---mojut.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/1b93g96gm8j8kv2tda3rsh2i01/35039738856.pdfIn PDF document text
    • https://service-panev.com/userfiles/94150122941.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606c99302b107---gajanabokotamu.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/9ss5djfcqlvnh6hp8mhjjnbk17/89233484110.pdfIn PDF document text
    • https://drivetripper.com/userfiles2020/files/18349763452.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=horned+moses+michelangeloPDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000efc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC8 18680 bytes
SHA-256: 853ba2f22f8912b2f5d0c5b2065929eedc7ea00ff45552ac9fc6206e9db3b723
font_01_sfnt_off00012056.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12056 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001386d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1386D 10712 bytes
SHA-256: 27b106206a561383a4f8baee8f82253f51ced8b6252dbd644536c2a0f73b5fe2
font_03_sfnt_off0001507c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1507C 16348 bytes
SHA-256: e3bf00921c0d58a208cf733fe2b0a23738e0d1aa7f36e75428bf1519a74c9b64

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