Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d6cb1c6dfaf9a03…

MALICIOUS

PDF

81.7 KB Created: 2021-07-16 10:03:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 3c6e45568fc39e8a767f633269aca317 SHA-1: 2d0c48281964808e69c6baa3557eb00601b68788 SHA-256: 5d6cb1c6dfaf9a034110bad958aa1e5089ccda1face370dacd3d1435d4907e91
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. Static analysis revealed it functions as a link farm, with numerous URLs pointing to compromised WordPress sites and other disposable hosting. These links are likely intended to lure users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6f72acbad---tetasofiguli.pdf In PDF document text
    • http://gpszone.hu/upload/userfiles/file/sokered.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160b3d314bf434---bokaturigodasederel.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/00f80e99f61c4484d8cf5cff53f8f5c9/83328823889.pdfIn PDF document text
    • http://bio86.fr/fichiers/53255618296.pdfIn PDF document text
    • http://hayatteknoloji.com/webimage/file/veforezipadazegivavapudeg.pdfIn PDF document text
    • http://brezov-gaj.si/uporabnik/file/18715263817.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/acd01f93ab83c4c6aa91d84a878bc091/mefevuridakigaperakenakar.pdfIn PDF document text
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/a1ad9dc1c40a587c53b0e9b34cf49cda/golaruxivem.pdfIn PDF document text
    • http://puntolinea.org/userfiles/files/lefakazozidofarigigum.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160886aa669569---54087649463.pdfIn PDF document text
    • http://cpbnatation.fr/fckeditor/userfiles/file/23539602530.pdfIn PDF document text
    • https://lesartsdansmonjardin.com/userfiles/file/20210517015535.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/v2kcvq8jhh5mtf8msrbd2ocv2n/12457732199.pdfIn PDF document text
    • https://cleartunemonitors.com/ckfinder/userfiles/files/fadapetadigizagijidu.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16099bba6a4dbb---80971775421.pdfIn PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/99fe4494ac6d50707517063739f3eed4/79267287628.pdfIn PDF document text
    • http://travelport.pl/userfiles//file/pevojelus.pdfIn PDF document text
    • https://digireg.it/upload/magoxenawuk.pdfIn PDF document text
    • https://akvaguru.hu/user/file/vibiv.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/3a7e85c9b20caae5b0483b737bed12d7/pidesofesimunekupujufena.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/e8ba115613847cb5fcfa9bfbac5b200a/lotogewatugaxizum.pdfIn PDF document text
    • http://waterlootour.com/FileData/ckfinder/files/20210611_35EA6BB33274E5F7.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609edfc676633---83974531551.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607f5e95ed5b0---piweluxukapejavubarazik.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/obfh4sb1274rh3gtf56ada5kja/65171405271.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=large+kitchen+equipment+and+their+uses+pdfPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dce7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCE7 16512 bytes
SHA-256: 7a5f978ac84cc7353ed3bd019d94ae54156469310dc95959ebed55c5dd219eb4
font_01_sfnt_off000107cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107CC 11196 bytes
SHA-256: 7bac120a468f6cb0b6c63a58de05822ca4f4d5847a24206754e344df0a9a559a
font_02_sfnt_off0001214e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1214E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1