Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c1cb7753f8da963…

MALICIOUS

PDF

77.1 KB Created: 2021-07-20 16:43:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 82ec5a830919c31db001a7faac58f698 SHA-1: 38f2379c7f014c7188f23474c2bf11a2447d5a8d SHA-256: 1c1cb7753f8da963b5676bc71488f0db91fc9c6e987dc43e17c9b55e6f8c1e84
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 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. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160857fd943c3f---32716765515.pdf
    • https://alperbehang.nl/userfiles/file/68522558470.pdf
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/f293f71ffbd0a25b89e4e3a541d4207f/87552596882.pdf
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/5e9833e9e5ea594ea88689fadfb52f63/xemunekipowe.pdf
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/192ab1ee3ac648e7f4ab373cbf3a8efe/59049606739.pdf
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070f614948f4---21035423982.pdf
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/9590c4c4a5f84cd7d6a356dc56e8cf6b/89296961172.pdf
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1608dfd0f352c5---derirelimo.pdf
    • https://akapacha.com/userfiles/file/5800422849.pdf
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070dbe1d45f9---46791230820.pdf
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/3b48856d49a56c8fc14a4ff99b0b15d2/japopije.pdf
    • http://dienvietbac.com/uploads/files/gozewubaronuzuwilovupe.pdf
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/3qna8np285tdd9cqq83qlnknc9/18261118408.pdf
    • https://vanrun-it.nl/userfiles/files/53685496755.pdf
    • https://plasy.com/uploads/file/50347001514.pdf
    • https://cgeminfos.ma/upload/file/7679037465.pdf
    • http://csc010.com/userfiles/file/20210718193117_hkaz7g.pdf
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160df98cee7fea---jekepu.pdf
    • http://ankamet.com/userfiles/file/86226531275.pdf
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a23dd2db895---fakugowutoz.pdf
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097cc2c8950f---supenitimazokabaduzepem.pdf
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/3b4af74ed3362b49e13b59765a493c76/gomivuxekujuxipi.pdf
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/a0f136075503cd527bf616e5b6b4218e/bukizugawozagolonexekusul.pdf
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/c6oa5l53rk5qh6iuot7feee6c3/siposedenimavubil.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=wuzzle+puzzle+answers
    • 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_off0000c93d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC93D 16792 bytes
font_01_sfnt_off0000e154.bin
1ba58ff307109612c5a78087e13b2957adc22477f7fa2656a78f8080d0d86f44
pdf-font-stream PDF embedded font (sfnt) at offset 0xE154 10172 bytes
font_02_sfnt_off0000f858.bin
306e9c82acf4e8b40f5c3cef337209857d49faf1eb161bb5bed4f46a94555ebe
pdf-font-stream PDF embedded font (sfnt) at offset 0xF858 17348 bytes