Malicious PDF — malware analysis report

Static analysis result for SHA-256 e95aa730c22258ab…

MALICIOUS

PDF

91.9 KB Created: 2021-06-30 02:22:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 2b510bb29c7e3e24a615fa2413938527 SHA-1: 45a31730307955b27b98c90036d9b27174a7abb4 SHA-256: e95aa730c22258ab88459f0faecb509ebe457e6c8728fb8376d089de436587cf
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites, likely intended to host malicious content or redirect users to phishing pages. The ClamAV detection and ML classifier strongly indicate malicious intent. The presence of numerous links on disposable hosting and compromised CMS upload storage further supports a malicious campaign, possibly for distributing malware or conducting phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

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://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/16083a076845c5---52568215309.pdf In PDF document text
    • https://colakcivi.com/userfiles/file/ludijisozowoxabobudabal.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609e2fada5d92---mibaludalakomomuja.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d7f181579f---gupak.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/1608b4b788b36b---28031977198.pdfIn PDF document text
    • http://accronline.com/userfiles/file/38043272310.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/aplfkl26s0j6jh6h56bek54ova/90569263045.pdfIn PDF document text
    • http://therealmccoyfamilyreunion.com/clients/f/f9/f9ea119420dddc0cc5ac7622830b9f68/File/xelirodatajidumomaraj.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbfe789f86---58150129448.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/fegorekobajozo.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a0551a28bd---vexikojijifopufaxim.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16094c86e5669c---gexor.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a931d2a8747---mudiwilesujimo.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160797ce6327ab---buxulovu.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160742c88a7756---vijotekibikatipepimabako.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160b2a7a0be0b3---34551290160.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/16072554dda1a9---16433311379.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/61291376210.pdfIn PDF document text
    • http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097e4f989ecd---26793500871.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ab609bbb51---kosetejatulojevor.pdfIn PDF document text
    • http://pincailight.com/zk/UploadFile/file/2021063006525973499.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609158acc51c7---6097261687.pdfIn PDF document text
    • http://hakkabrothers.com/userfiles/file///fodaz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=young+feet+camPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00012ed8.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x12ED8 17876 bytes
SHA-256: e7e7cb1430ebca1ac444ede34f6f92244b8a19c80c44b32e8f2b3d891e4f2973
font_00_sfnt_off0000e98b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE98B 17528 bytes
SHA-256: 50f6dc2ec68bb67009c0b2abeb9ff4fdf565689dc0116d6a2809403c7c7f32e1
font_01_sfnt_off00011764.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11764 10356 bytes
SHA-256: 285cc4a819c823bae541c5231619a5f760afcfb987635fd76651639daea2d63e
font_03_sfnt_off00014a46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A46 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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