Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d977249f7468e7d…

MALICIOUS

PDF

71.3 KB Created: 2021-09-01 19:53:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 38eb7649c12f3bd6aa42a2056b06ad29 SHA-1: eebbee55b2b7fbc6d7b81b53a98842492faafdb5 SHA-256: 4d977249f7468e7d2b6bdcf0f3b5a6975e259662d7f1778899e1daaa500ad77b
156 Risk Score

Malware Insights

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

The file is a PDF identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan delivery mechanism. It contains numerous links to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and unreadable, providing no direct clues about its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://dichvutheapec.com/upload/FCK/file/sevuk.pdf
    • http://texmet.pl/userimages/file/vosikokiwemumezesu.pdf
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/4cfb7766d84d709beb50e46a76c45f90/71674087148.pdf
    • http://omonetach.pl/foto/ilustracje/file/46000695451.pdf
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d55d337208---bejos.pdf
    • http://balone.net/_upload/file///xabidupimiririjatuxavulaw.pdf
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160864f4ca7bf9---37011461996.pdf
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/160af9e6912530---pefagagovosobawekazusir.pdf
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160810d42adf71---jibixuwuwinoki.pdf
    • http://royalgroup.at/tmp/71977444588.pdf
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078126f6ca5f---wegoxoveleg.pdf
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/35424e61e83894b9021196f63508ee47/24552937376.pdf
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d0924193909---11044873981.pdf
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/r4jfbgq2ink19bnt1u1j5tpu1t/98214549010.pdf
    • http://sun-tes.ru/files/file/fepemanomuzolezotonodutin.pdf
    • http://koreabulk.net/userData/board/file/96675558343.pdf
    • https://flyingfish-stay.com/userfiles/file/92941171843.pdf
    • http://capri.lt/userfiles/files/romakazilesipikazar.pdf
    • http://akcjonariusz.com/UserFiles/file/fawokovi.pdf
    • http://shipagents.nl/uploadfiles/file/48423972488.pdf
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b24a23b22d0---joluverojaku.pdf
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/pewetuginafekovuwa.pdf
    • https://thebottombillion.org/business_school/uploads/file/wafojapuzuzir.pdf
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c4f47ddef9c---jiguluvomirade.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=movie+review+format+for+high+school+students
    • 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_off0000b8d3.bin
d5af96a7178ef66b609df1b00fde56eb90761612517060a5dcc47924f17bb9cc
pdf-font-stream PDF embedded font (sfnt) at offset 0xB8D3 11168 bytes
font_01_sfnt_off0000d2a1.bin
ecb50fe89f1e7e3bcef821d284cc8e8e68da02d6a7957f4b5440114640f0d11d
pdf-font-stream PDF embedded font (sfnt) at offset 0xD2A1 14652 bytes
font_02_sfnt_off0000f749.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF749 16792 bytes