Malicious PDF — malware analysis report

Static analysis result for SHA-256 921f27bec34a42b5…

MALICIOUS

PDF

85.6 KB Created: 2021-07-04 06:03:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 9bab6f5dcab5a88e6dc8e73b8142e295 SHA-1: 35c382c7fe853aba3eab71548b56ef6b7c0ef790 SHA-256: 921f27bec34a42b53f3b2122b01071e0257efa331bc97ceaedbfe2b9bea3cd55
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various websites, many of which are hosted on compromised CMS platforms or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these links. The document body is heavily obfuscated and does not provide clear textual content, but the heuristic firings clearly point to a link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://lifemartrealestateconnect.com/wp-content/plugins/super-forms/uploads/php/files/9iqliie023518fr7f4cvtarhg0/kinixosaxukal.pdf In PDF document text
    • http://vanphongphamhienluong.com/upload/files/22460594774.pdfIn PDF document text
    • https://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/dgdjrrhmuftlsg993dfqvp9bv8/tomakubigazulaxejalabiwom.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/b5122e7becf96a803557a6e7d58333d1/83795402350.pdfIn PDF document text
    • http://www.prieteniitehnicii.ro/documente/file/bofirasudubo.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/38964124039.pdfIn PDF document text
    • https://noddy.nu/images/file/zizeteluj.pdfIn PDF document text
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/826575ebbfb70eef123d68a201947826/71571547422.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/31c022a5b02e6be65ca6676f9fb07ac0/kamikefarudatagetozatamur.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc40f58017---25681583562.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fbe3903a52---11645763939.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/2tccd5kg8jkt60tk0prsrhbabp/30761325716.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/160bee85cdfbde---jemose.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/a242db20e86797c956afc459ca27ee48/67650358621.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ab5b3648116---faxujebufa.pdfIn PDF document text
    • http://angarakshaksecurity.com/userfiles/file/91094931078.pdfIn PDF document text
    • https://sieuthigo.vn/upload/ck/files/fiwelefisugabolisafidat.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/eftu9lp2iilsa8lubmq78j5fh4/97483610350.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160b4b6c73d4c6---10679628727.pdfIn PDF document text
    • https://hijaulumut.com/contents//files/jirotufuvomujameturawaj.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf27196e110---bijajal.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/62904d1730f4a7f839ae8958b8bb186b/90482786000.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/16084af2073191---womevujiside.pdfIn PDF document text
    • http://banghetretunhien.com/media/ftp/file/59071753231.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=temperature+in+zion+national+park+in+marchPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ecba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECBA 10688 bytes
SHA-256: 6bb06e68c19f72a4e0af0484ced3b739345b7ec0f4c7358d242cdef5afef1e06
font_01_sfnt_off00010503.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10503 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D15 16732 bytes
SHA-256: 90caf3ff28db250bd89cce15440d4afc4e216ee1c10dab234619cdda34a9c47c

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