Malicious PDF — malware analysis report

Static analysis result for SHA-256 71665a920db62018…

MALICIOUS

PDF

85.0 KB Created: 2021-09-10 20:36:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 28cadf61de86360e6dfec037c3edaaf9 SHA-1: d3db2f0e442a41123bb156f0213bf6fb3e9ef6af SHA-256: 71665a920db62018f9892609787727b26387b4e92efb0a1c221db819d40402bd
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics indicate a pattern of using these sites to host or link to malicious content. ClamAV detection and the ML classifier strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://ketchas.ru/uplcv?utm_term=deku+heroes+rising PDF link annotation
    • https://rafaellopezehijo.com/upload/files/66204450996.pdfIn PDF document text
    • http://gpp300.fr/userfiles/file/lejeniri.pdfIn PDF document text
    • https://combrooncom.com/contents/files/47452170356.pdfIn PDF document text
    • http://phutungtdc.com/upload/files/vodotuzufijumerib.pdfIn PDF document text
    • https://arvikabc.com/images/uploadedimages/file/785545584.pdfIn PDF document text
    • http://rentappli.com/tinymce/jscripts/tiny_mce/plugins/phpimage/phpimage/upload/images/file/47467885732.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/16139307d1cd66---vadaleweduwikaru.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/161376e423c89d---xivometosadugenosibet.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137781661197---96946401687.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613acf25a30d8---17202646621.pdfIn PDF document text
    • http://njchemland.com/upload/files/7579686532.pdfIn PDF document text
    • https://saint-florentin.charcutier-traiteur.fr/ckfinder/userfiles/files/4805295463.pdfIn PDF document text
    • http://tribo.kz/userfiles/File/robegele.pdfIn PDF document text
    • http://studiolaviano.it/userfiles/files/tajetefel.pdfIn PDF document text
    • http://tatvideo.ru/ckfinder/userfiles/files/23069041628.pdfIn PDF document text
    • https://webmakler.org/userfiles/file/99011214987.pdfIn PDF document text
    • https://receptabc.hu/images_banner/files/sugivasiliderotijoje.pdfIn PDF document text
    • https://orrizon.ru/images/file/saniz.pdfIn PDF document text
    • https://aromamarketing.md/img/files/bedozunovumakevofukalixik.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fdcf861118---nuresawokizizu.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612e99ff463a7---zaxanabubumuloxitonir.pdfIn PDF document text
    • http://xn--12cf1djdb6cbcafdbu1f1cudgcc8am4wf7htgd9de.com/ckfinder/images/files/sisaxapasenij.pdfIn PDF document text
    • http://kvrhousing.com/uploads/30170819937.pdfIn PDF document text
    • http://automotiveenergy.cz/userfiles/file/gobesiku.pdfIn PDF document text
    • http://lamelove-zakryti.cz/userfiles/file/pogixurunapefopuzalelo.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613b74699c574---96442001444.pdfIn PDF document text
    • http://machinesupplier.cn/data/product/file/202199_64843_693.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_off0000e78d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE78D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ffa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFA4 10272 bytes
SHA-256: 2e3fbd5945810acb88cbe7cf5529555b31ba05e2ac0724ed208ac489e562fe67
font_02_sfnt_off000116b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116B7 18156 bytes
SHA-256: 1a14bceba7aca4e3ecd15b15381d8e4cb4a18db5603697e919169e459888854b

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