Malicious PDF — malware analysis report

Static analysis result for SHA-256 b96832af9876758d…

MALICIOUS

PDF

70.3 KB Created: 2021-10-02 21:24:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 8156a33af37bfd9453621667a6bb7cd6 SHA-1: baaa8ae28992f52731842202ad674aba4c4bd4ff SHA-256: b96832af9876758d328f62878a2868f2c9f912789552293aa7ad71a82de4cde5
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS platforms. The PDF structure and embedded URLs suggest an attempt to lure users to potentially malicious sites for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://crysiq.ru/uplcv?utm_term=hsa+eligible+items+irs PDF link annotation
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161405015ac41a---15386599489.pdfIn PDF document text
    • http://carszana.com/image/upload/File/42138964493.pdfIn PDF document text
    • http://slhospital.com/upload/fckeditor/file/65565486146.pdfIn PDF document text
    • https://brianhigbielaw.com/UserFiles/file/52977914141.pdfIn PDF document text
    • http://aktifimmo.lu/userfiles/files/29295683066.pdfIn PDF document text
    • https://ibexquimica.com.br/ckfinder/userfiles/files/nuxepepiturukilokexe.pdfIn PDF document text
    • http://rentaruedas.com/files/others/bunaxabejefixuz.pdfIn PDF document text
    • http://ghefoot.com/fckeditor_userfiles/file/tuzivapobosoxepubi.pdfIn PDF document text
    • http://stauarchitetti.eu/userfiles/files/mufujowutajezajaluvaweti.pdfIn PDF document text
    • http://dxqzx.com/ckfinder/userfiles/files/20210928_122709.pdfIn PDF document text
    • https://gruntbudowa.pl/files/file/kusimijopuji.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/rorelutatus.pdfIn PDF document text
    • https://borsalino.ro/imagini_ws/dosuwas.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/kokevunew.pdfIn PDF document text
    • http://lamardaegu.com/upfile/user/file/71653730228.pdfIn PDF document text
    • http://domesticsolutionsagency.com/userfiles/file/83133238100.pdfIn PDF document text
    • http://karinameal.ru/imgdish/files/91408213753.pdfIn PDF document text
    • http://movesearchesuk.com/userfiles/file/bibinupirupimonowifo.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/1a0e12bf0031487349b6bf7bd8d3d2aa/78672964140.pdfIn PDF document text
    • http://czpohledavky.cz/userfiles/files/zuxixunuvujuvi.pdfIn PDF document text
    • http://www.binghan.my/userfiles/file/wetofirepologozow.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613139508f46c---89680073201.pdfIn PDF document text
    • https://wrd13.com/force/file/44538063035.pdfIn PDF document text
    • http://e-sportis.com/images/upload/91415696780.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_off0000afb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFB5 16780 bytes
SHA-256: c216a7693788ff0596122835f2b058b825935581c12c2b2a3dfc4d6964969a3a
font_01_sfnt_off0000dab8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAB8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f2cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2CF 10356 bytes
SHA-256: c0e4ad810553b0c090f80950d0f7b89345c10bd560702415f959d6669a55b031