Malicious PDF — malware analysis report

Static analysis result for SHA-256 f12773ce388b0ea7…

MALICIOUS

PDF

108.8 KB Created: 2021-06-28 08:05:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 15ae09075f0839bca918d464e4d3c1e3 SHA-1: 281fe641c8eb08e11d14f8be2f338b9a700644f4 SHA-256: f12773ce388b0ea7daa7a783f21098d262ab23a91ffce9da05d0d55b11925d81
156 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised CMS upload directories and disposable hosting, suggesting a link farm designed to redirect users. The PDF structure itself is also flagged for duplicate object bodies, which can be used to obfuscate malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9797

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://adamlegal.com/userfiles/file/jobiv.pdf
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/160815fadb4830---deluloni.pdf
    • https://fablab808.com/nbloom/fckuploads/file/20213582926.pdf
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160742ed402265---27027785423.pdf
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/a87cc95c97f7ca53c52a4e42f29cfc69/kikatiwoniwozukolek.pdf
    • https://xo-sound.ru/userfiles/file/64178183624.pdf
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/80d72054e9991133e2646d6dde9b7e30/55727608018.pdf
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160788157d8c4c---gigewabavupabelewarur.pdf
    • https://inncredel.com/uploads/zovino.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b705d521e86---sizasadasutotogo.pdf
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160895516e75fb---16535913412.pdf
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d3ae5be043e---18270877712.pdf
    • https://majubesar.info/contents//files/sujapenoxi.pdf
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/160bc797bc3a0d---nitererizisaro.pdf
    • https://artenika.pl/fck/file/tajutajubadewiparuvigiza.pdf
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/9bbcdcae5e764c6222b50fd24eab93b9/74011758748.pdf
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/922egalfl7nvuuv2k1brmqmeh6/lafavijoguzuw.pdf
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c187dabd8ed---97230109434.pdf
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cbc861c6752---lujupupufi.pdf
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a3127c327c---63133916778.pdf
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/c64f33eb7ace8797be73bf59b48d9873/92489097568.pdf
    • https://cytairtool.com/test/userfiles/file/20210608_f9fc6.pdf
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bff5d0436e1---kadisiwupudatazinoxipopu.pdf
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/ae4f097da4c404f177d9900745f87163/53441890917.pdf
    • http://montaze.org/democms/userfiles/file/zozigaku.pdf
    • http://billsky.ee/files/file/tipekunejagagiwawazaf.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=pokemon+detective+pikachu+full+movie+tamil+dubbed+download
    • 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_off0001403b.bin
aa4d2ae4e57f30af3286accbcee8710bb04c47caccd6c4b183e7f845545fd2f1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1403B 11100 bytes
font_01_sfnt_off000159c0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x159C0 16792 bytes
font_02_sfnt_off000171d2.bin
cdec001e837959cd6f62abc168da765d4786d66b319028b4b1773782a60ef733		 pdf-font-stream PDF embedded font (sfnt) at offset 0x171D2 19616 bytes

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