Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cc355b8da0cc3f9…

MALICIOUS

PDF

81.6 KB Created: 2021-06-15 20:42:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 95d23c15d4ef084a4a168afb01b9bc74 SHA-1: 4326ff9dbf807ebf01ba82a5a9f22a96552c7593 SHA-256: 8cc355b8da0cc3f92ec1bfb52182d9c991fc434bba574bd70263809670617996
164 Risk Score

Malware Insights

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

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 and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://laborke.ru/uplcv?utm_term=merge+two+pdfs+for+free PDF link annotation
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/31ec8b4a316f2baa2967481f0f06713e/53605484054.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/j4j5eej0d9gvn434n4s92hop1n/99800483052.pdfIn PDF document text
    • http://gianphoiduyloimodel.com/Images_upload/files/12763824856.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cd5cb0abde---37346759398.pdfIn PDF document text
    • http://sakuragiramenandsushi.com/uploads/files/16245687902.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/2747422667.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/5ni5jgjvhj8shrcidjol49ucb3/62981350130.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/9c5acc8f125e38f6770bde329a6e208a/wabadulinejikepibov.pdfIn PDF document text
    • http://allycatering.com/userfiles/50393162766.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/0b5ce7d1a45d9420e8fd72fd7088ae7c/67070515121.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/1608f50e09a0d1---30604292418.pdfIn PDF document text
    • https://its-bulgaria.bg/files/file/84372382181.pdfIn PDF document text
    • http://vmkmsz.hu/userfiles/file/81226047985.pdfIn PDF document text
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a20603e7e25---22352121416.pdfIn PDF document text
    • http://adams-gold.ru/archive/image/file/22904642001.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/vomulewososep.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/0b39034619855fed0c271b5103d0e94b/fagubifotutanagugozumeji.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eceb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECEB 5064 bytes
SHA-256: 0b0fc8fde6f1d190ebd5c8c94f4d811958a6f3f32c4a28f2bf13169e418c2303
font_01_sfnt_off0000fe5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE5C 11072 bytes
SHA-256: 36097f8e7ff6f6fe78efe6b15ae055916f3761e3db3483203cd51d87aabd6ca3
font_02_sfnt_off00012486.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12486 16092 bytes
SHA-256: 9af6fc3bf9d751f70540aea0fa47faa159a3604992cda23d2adcda3ffc5346b2

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