Malicious PDF — malware analysis report

Static analysis result for SHA-256 d02ac323e6f386cb…

MALICIOUS

PDF

79.0 KB Created: 2021-10-20 15:28:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 78cfe4addbdb19e47842c32697f96a69 SHA-1: d514250652afe237555fabb54d97dce52885e99e SHA-256: d02ac323e6f386cb5540057f0675aef84a8aaa995176b6023ccfe17845222be3
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are consistent with a malicious PDF dropper.

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 https://coretry.ru/uplcv?utm_term=mesothelioma+other+causes PDF link annotation
    • http://sentai.cc/data/file/20210927_093732_713.pdfIn PDF document text
    • http://klenderbio.com/upload/files/35047030685.pdfIn PDF document text
    • https://akemi.ro/hirek/file/77117627270.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/xaluzogikoz.pdfIn PDF document text
    • https://bibonatura.hu/ckfinder/userfiles/files/salolomemumazudaru.pdfIn PDF document text
    • http://kanchanaspa.com/ckfinder/userfiles/files/99221364922.pdfIn PDF document text
    • http://supermarketdv.ru/files/file/zimobemu.pdfIn PDF document text
    • https://md-bud.pl/szklo/photos/file/70481102345.pdfIn PDF document text
    • https://www.de5dollarsdigitizing.com/ckeditor-ckfinder-integration/uploads/files/rinifuvamu.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1615e0e054d910---pigebogibosetavaze.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/16168014635c73---59726332963.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/53158590670.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615b95bcbee98---41198822112.pdfIn PDF document text
    • https://takarasushimn.com/userfiles/files/90497353274.pdfIn PDF document text
    • http://kayamedbursa.com/userfiles/file/gedujexivapawi.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/16168f10fb2f7d---13516112805.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/16146f6c6d3695---19401813732.pdfIn PDF document text
    • http://saint-party.com/media/file/tesuluruzonupipovumo.pdfIn PDF document text
    • http://3e3i.com/UserFiles/file///65834711524.pdfIn PDF document text
    • http://xuanfe.com/uploads/FCKeditor/file/28936581999.pdfIn PDF document text
    • http://dgxzz.com/uploadfile/file/50474394210.pdfIn PDF document text
    • http://sarigol.kr/userData/ebizro_board/file/kebebolipixoxut.pdfIn PDF document text
    • http://sibaco.ru/ckfinder/userfiles/files/pesenewubevuf.pdfIn PDF document text
    • http://ecogestval.com/userfiles/file/punoxizexiwijezago.pdfIn PDF document text
    • http://zoncmswebsitebeheer.nl/files/editor/file/dadebej.pdfIn PDF document text
    • http://griesvoegwerken.nl/UserFiles/file/vunuramubepejonava.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_off0000d2f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2F5 16912 bytes
SHA-256: 384497c8bfc6150e41dc487cbbabeba64ab5594842a56d0b6efb2fa4f7b6e9b4
font_01_sfnt_off0000fecb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFECB 10484 bytes
SHA-256: 04bc47b3156aa908201508d19b63ae2b1b5691aeba4b8e6babd504721594cd3b
font_02_sfnt_off000116a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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