Malicious PDF — malware analysis report

Static analysis result for SHA-256 a68982987e49679a…

MALICIOUS

PDF

85.7 KB Created: 2021-09-04 18:13:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c2586a5aa90e4f75a56d38c6a0eb6f35 SHA-1: 138a70f176a3c40e48009898f106195c0a27ff4c SHA-256: a68982987e49679adfa7004762ad009a4f475f05e40f3e005d0587e7f331b6c7
96 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs, many of which point to compromised WordPress sites. The ML classifier strongly indicated maliciousness. The primary attack pattern observed is the use of a link farm to direct users to potentially malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 5

  • 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://crysiq.ru/uplcv?utm_term=cognitive+linguistics+and+translation+pdf PDF link annotation
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c142b0a429f---robedazukarepus.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/d54fb95b3cc6853b7516c0943ce8d41a/mifib.pdfIn PDF document text
    • http://fsnmmaterials.com/UPFILE/userfiles/files/65584711558.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/63a5b894c4d7085424ef9cce9e571d69/voweb.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bba9efaaff2---54970740558.pdfIn PDF document text
    • http://zehanbiopharma.com/upload/files/91745536461.pdfIn PDF document text
    • http://pwr-tech.ru/userfiles/file/70677423863.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/16102dbb9bb48f---71826382321.pdfIn PDF document text
    • http://suachuaspa.com/upload/images-content/files/45201229761.pdfIn PDF document text
    • http://www.ctnphrae.com/ckfinder/userfiles/files/gefowonovefobodozazosolu.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bf8e2b3198d---kawivuxaxagapodi.pdfIn PDF document text
    • https://datatech-int.com/userfiles/file/dakasagapelavaguji.pdfIn PDF document text
    • http://sakuragiramenandsushi.com/uploads/files/zonuxamopu.pdfIn PDF document text
    • http://drive4smilesontario.com/clients/e/ed/ed023a0734c265ca673a92d1d81de675/File/nazakuminejekuwixu.pdfIn PDF document text
    • http://pscworld.eu/ckfinder/userfiles/files/sepesa.pdfIn PDF document text
    • http://xingyeknitting.com/userfiles/files/goduzogemopozaselokukelip.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d2a1a82151a---36704693095.pdfIn PDF document text
    • http://palletgoanloi.com/img-dn/files/basolopikezazikuti.pdfIn PDF document text
    • http://dlevitin.ru/fck_editor_files/files/71074158602.pdfIn PDF document text
    • http://knshzj.com/CKEdit/upload/files/53364962485.pdfIn PDF document text
    • https://campermagazine.tv/public/file/botezaxekedazotakagor.pdfIn PDF document text
    • http://drironcat.com/images/file/fojozasomawavotowomage.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608ad2ac284c6---dobikobifevup.pdfIn PDF document text
    • http://cathyknightwaite.com/ckfinder/userfiles/files/jukamimezulutiwesasajoz.pdfIn PDF document text
    • 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_off0000e8d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000100eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100EB 17888 bytes
SHA-256: a8fb25a6191f9e457bc993193780e97a83c7393bc8f5a6d6e6ed877b7f4e4152
font_02_sfnt_off00012f4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F4C 10992 bytes
SHA-256: 88d161b11198cf6583fb96bdb224273fda0f0734fa6eb8e92bc3633fe058962e

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