Malicious PDF — malware analysis report

Static analysis result for SHA-256 7da948aee2063b1f…

MALICIOUS

PDF

113.1 KB Created: 2021-07-13 19:51:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 77c65a9d94a8c71cb781420ea29e8060 SHA-1: 26799f4b27900ce2139623b2099e96631d0238fa SHA-256: 7da948aee2063b1f558ff245f7ede655e1a4ced2f42bc9cbac0394c0592553da
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, indicating it functions as a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9746

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://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e35c884c95---38801818283.pdf In PDF document text
    • https://hkbca.org/UploadFiles/file/20210603195726192.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160969999cd305---26713003807.pdfIn PDF document text
    • http://lideparts.com/userfiles/file/1624116951.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/20430178459.pdfIn PDF document text
    • http://d4storonto.com/clients/e/ed/ed023a0734c265ca673a92d1d81de675/File/5542139830.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/301444b2b1de978886d2e79d1a9f9cdc/gobejufexozizem.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1609cbea47eae1---52443098170.pdfIn PDF document text
    • https://thaiwoodengames.com/files/upload/files/fozozidotagumanike.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608dc0e07b6d9---gogedegasatali.pdfIn PDF document text
    • https://bilalyapidekorasyon.com/userfiles/file/44681096100.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160966dcd32eae---wifavesilanazefunod.pdfIn PDF document text
    • https://akvaguru.hu/user/file/vomimakipozamebim.pdfIn PDF document text
    • http://timelessmebel.ru/wp-content/plugins/super-forms/uploads/php/files/57d52949c123108e81f61460254e3ebc/16146227340.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072b04ced061---munomabunakuxoredakumaw.pdfIn PDF document text
    • http://atenngo.com/admin/sites/site/documents/98074125708.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160826818acca0---pitakuferixekofugowet.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160746532b9c71---bamobizu.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/16082fc970bcc5---71934411497.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/dd57412006481911fa174889674aa584/nizizepen.pdfIn PDF document text
    • http://gianniarnaudo.com/userfiles/files/xisikipamunugivudili.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/38b8554ddace76363ec4d2c6a2f4f5c4/28150430587.pdfIn PDF document text
    • http://doubletroubels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606effc142161---64421919897.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=meaning+of+pervasive+in+englishPDF 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_002_off0000f713.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xF713 29804 bytes
SHA-256: 5dfc5d2d40d7f1681c078599850e51841ff4d60bf2092de58d2c9aee0df37205
font_01_sfnt_off00012dfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DFC 10600 bytes
SHA-256: 7344ac38e0e1b42ce3a43fa5db8200866b5cf076d486d92b45a7a5ada13edf4e
font_02_sfnt_off00014617.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14617 28072 bytes
SHA-256: 69b17d159b5eab2981df49ae23f7ea083025d58ffb10355d9e20057a04fa4396
font_03_sfnt_off00018944.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18944 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_04_sfnt_off0001a151.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A151 5112 bytes
SHA-256: a4221ce223287d73b7d5cebbde484b23474328318cb950079772cf58d530870b

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