Malicious PDF — malware analysis report

Static analysis result for SHA-256 b497203452f32398…

MALICIOUS

PDF

89.1 KB Created: 2021-08-08 04:57:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a2bfb1069833a0dd93d4d1394f7cb84e SHA-1: 4738b0d47749c152f2e44d85b7729782caa8bf3b SHA-256: b497203452f323987e9b8deca9f809b248c62b82bd59ec9adf31bf6e212c526d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by a machine learning classifier and ClamAV. It functions as a link farm, directing users to numerous external URLs, many of which are hosted on compromised WordPress sites. The presence of external URIs and the nature of the links suggest a phishing or malware distribution attempt, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://smidgel.ru/uplcv?utm_term=figuras+formadas+com+tangram+para+imprimir PDF link annotation
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ef3f9efbfc---bovuxalajub.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/1c46fd12963a07e51db3272c2289e9c8/lagevudejegexuwovigevinov.pdfIn PDF document text
    • http://kccmaul.com/files/files/69211704462.pdfIn PDF document text
    • http://maychaybocaocap.com/app/webroot/uploads/files/mazebufivipofelil.pdfIn PDF document text
    • https://matrainagycsalados.hu/userfiles/file/putegib.pdfIn PDF document text
    • https://www.ideaklinik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607156cc01cf6---89826424014.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/lhegfdvutc5urph76tekr7vjms/13780775669.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/f60f6ca4a8f06a324a429d82ae6e104b/zebidujojotasedepapa.pdfIn PDF document text
    • http://sshs1962.info/clients/3/33/33dcd814b32da85629335a95ab3d0158/File/morawunejune.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/7b25d376fef7c9b339b05484a41949ad/21089730122.pdfIn PDF document text
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/8c54e017ad33694b0e884384852ddbf5/zedinukanelujujokitasaf.pdfIn PDF document text
    • http://studiofranzoni.eu/userfiles/files/juderisefoxebosimagokaji.pdfIn PDF document text
    • http://app8itebarandgrill.com/admin/images/file/jixapivawod.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f05fe45976cfd189390715ff85aa286f/4309205522.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/546baee711e1ba720f42ab0f39199872/75518851041.pdfIn PDF document text
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/16072e54480c04---65024455402.pdfIn PDF document text
    • http://china-baby-clothes.com/d/files/81930164623.pdfIn PDF document text
    • http://maychamsocda.vn/images/userfiles/file/xupupilulosirisopedel.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/9ab2ebccc4c7485eab04a144921a6b38/nutinorejelaxoz.pdfIn PDF document text
    • http://93564497.com/userfiles/natosazugufodav.pdfIn PDF document text
    • http://erdivigado.hu/userkepek/file/80959041908.pdfIn PDF document text
    • http://www.corazondelsol.es/ckfinder/userfiles/files/65881435048.pdfIn PDF document text
    • http://teplorium.su/userfiles/file/2332669397.pdfIn PDF document text
    • http://gallery4walls.com/upload/editer/file/zuxasotajod.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_off0000f0dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0DC 10860 bytes
SHA-256: 15b567555389dd2abe3296a78f184fc246285de7cb596dfd30686ce9ace77cb9
font_01_sfnt_off000109b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109B8 20360 bytes
SHA-256: 014ddd37cc5e58916dbf377dc510902b1612a8734f7a15c9eabc1a9118cc25a9
font_02_sfnt_off00013bfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BFD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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