Malicious PDF — malware analysis report

Static analysis result for SHA-256 e44826cfd00c9b7a…

MALICIOUS

PDF

93.2 KB Created: 2021-08-11 14:22:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8901e0d5de1627b7bb2119da50fdc344 SHA-1: 07e5dd7df4456097928ecb3f1ce62389702ac77f SHA-256: e44826cfd00c9b7ab610e146305e7898e6cdb8695fe73c8d74c3d681fda049b9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised CMS upload directories and disposable hosting domains, indicative of a link farm used for phishing or malware distribution. ClamAV detection and ML classification strongly suggest malicious intent. The document's structure and URL patterns align with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/i9mbtmdvbq4qja04ej8ctaqoma/xotab.pdf In PDF document text
    • http://mientaytourist.com/uploads/files/nunupokenuner.pdfIn PDF document text
    • https://foxtailmag.net/wp-content/plugins/super-forms/uploads/php/files/a28545d9730a8f3628aff119de41ac73/jivigamatigemikupa.pdfIn PDF document text
    • https://gtselect.fr/ckfinder/userfiles/files/bukanelobajeberolivulasat.pdfIn PDF document text
    • http://loca-granderoue-montaletang.com/ckfinder/userfiles/files/guvozodejuwiremanunis.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210623234800149.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609ba719ba935---fanukigojodiwusakelulid.pdfIn PDF document text
    • http://auburn-companies.com/userfiles/files/vigunexujabojetojuzofu.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160940b0d315e4---losopo.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608153e696358---gupegis.pdfIn PDF document text
    • http://gesht.ru/admin/ckfinder/userfiles/files/pijaga.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076ed33083fc---fulebizatanowiwavokep.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/bibox.pdfIn PDF document text
    • https://cargotavio.ru/files/file/67997028224.pdfIn PDF document text
    • https://channeloflove.com/ckfinder/userfiles/files/53611525121.pdfIn PDF document text
    • https://gangnampools.com/contents//files/gezadenutitujefulijo.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/31ca97d5c3c9cbe30e6d73bdcf9f061e/jezoje.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/362159fff933f874ddbe7a578886bb82/94783778449.pdfIn PDF document text
    • https://teenvolunteerhouston.org/wp-content/plugins/super-forms/uploads/php/files/ab26f49f14916eba3e2decec806735b4/87345656935.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607cf77e38a81---nogomazezejizosagetaz.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/cmsr77jufi8geir0d2r0no9kp7/putakib.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160f4f04fdf28f---xaruwase.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e826849bb8---4243044148.pdfIn PDF document text
    • https://polaria.cz/images/file/58339607973.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=fast+and+furious+subtitle+indonesiaPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00010d80.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x10D80 17960 bytes
SHA-256: 52acac7be7da9e9654129c6cb5d02be298248702114fe0ea1bf7dfd891aae096
font_00_sfnt_off0000ca5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA5F 27228 bytes
SHA-256: c9f29d853f39d757560be7f9840dea3583a93c5a2e86fda037bc928d7458a8f0
font_02_sfnt_off00012980.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12980 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001418d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1418D 2296 bytes
SHA-256: 0d91b93c30cdb4b9fcc5287ef31e0f6d3b75050094e35c3303e90e7f2c1d387e
font_04_sfnt_off00014b8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B8D 10564 bytes
SHA-256: 61bc2115f3974eae78c9abf52bc882af2b278dcbe04de0d1dbce45c64af9a2a3

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