Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee2a08b22ddbae53…

MALICIOUS

PDF

84.2 KB Created: 2021-06-28 18:06:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 98eca3acb65b15ef09eb3ffa8717107d SHA-1: 007823e0461095384ad520dcc626670642b7e041 SHA-256: ee2a08b22ddbae53342b45262f2169ddcdce580a494eb9a752c4460b894f4c81
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting it functions as a link farm to distribute phishing or malware. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 https://namdolove.com/FileData/ckfinder/files/20210603_1CDBF62F856BC1A6.pdf
    • http://alpanelektrik.com/depo/sayfaresim/file/85978572822.pdf
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/f2aad6b2d578f603ce8914ceca06283b/kavoxitiwaroturo.pdf
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160ad325d5c4f7---17140932992.pdf
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bae553472b8---razevizibenamow.pdf
    • https://bloomeng.com/uploads/50796930678.pdf
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/bf90f24612840ccab3e6edb259b22ab9/jujilekanijefab.pdf
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/fb809naa61t6aa0nd45evlsa35/xusawemefigozuvof.pdf
    • http://bfr-bialapodlaska.pl/userfiles/file/81546466425.pdf
    • http://phuocthuan.vn/images/pic/file/nugudivegujezokifosefil.pdf
    • https://arch.ua/ckfinder/userfiles/files/bunusavokakuvezebuto.pdf
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/d0ca8ef3ed5140a6fb3ea512c2584e41/nigisunewokufozetudifus.pdf
    • http://alnadaoil.com/userfiles/file/fajosogotikemabiz.pdf
    • http://astro2sphere.com/admin/images/file/faronedifigageguzam.pdf
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/65aad355713b8e530bb05f859b0abaf0/68845435623.pdf
    • https://tungafilm.com/dorceiys/ckfinder/userfiles/files/duxufu.pdf
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/aaee5310600f82c0ca111c721af49256/71139088924.pdf
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160891ba332d3a---40382459309.pdf
    • https://nusantarabet4d1.com/contents//files/titagesafuzoni.pdf
    • http://www.abcklima.hu//data/editorfile/noxajazuwevi.pdf
    • https://soechi.id/userfiles/file/luzepomivapodaxubakaje.pdf
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d22a70b8ff1---23633053404.pdf
    • https://barcelonacentremedic.cat/files/galeria/files/73034440255.pdf
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/5abjcm58pq46kpt0okn87ijvem/70399584305.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=how+to+convert+a+json+file+to+pdf
    • 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_off0000e4f6.bin
eb8afaaaf4073bcdf191ac3a8ff138c9cc1b8a14efccc3ed12df7504502631f0
pdf-font-stream PDF embedded font (sfnt) at offset 0xE4F6 10884 bytes
font_01_sfnt_off0000fe38.bin
d2e759d545dc55744e494a0f35e18368868ab31b0c3aee070b6a5683319d2348
pdf-font-stream PDF embedded font (sfnt) at offset 0xFE38 17292 bytes
font_02_sfnt_off00012b45.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12B45 16792 bytes