Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2a77eaf44a0ce1b…

MALICIOUS

PDF

85.0 KB Created: 2021-09-13 04:05:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a34640a9f2e5490b6a978e89e494c52d SHA-1: a1ff2371dac41f0f7037401eccc3b9b3288dbd48 SHA-256: e2a77eaf44a0ce1b223af3ce8141a06488208bcd4ce0643f9279b3edc2bec73d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, many of which point to compromised WordPress sites or disposable hosting, forming a link farm. The presence of embedded JavaScript and a high ML classifier score, along with ClamAV detection as a phishing trojan, strongly suggests malicious intent. The primary goal appears to be redirecting users through a chain of links, likely to a phishing page or a malware download site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://cructi.ru/uplcv?utm_term=free+cable+channels+apk PDF link annotation
    • http://wxdyzs.com/userfiles/files/suwetigovunidazorukesowew.pdfIn PDF document text
    • http://nebovsem.ru/app/webroot/files/files/vitipur.pdfIn PDF document text
    • https://mbzl-pro.xyz/web/img/podborky/files/78008024706.pdfIn PDF document text
    • http://grandioso.asia/editor_upload_image/file/88492661190.pdfIn PDF document text
    • https://ajansnigde.com/resimler/files/bafap.pdfIn PDF document text
    • https://rais.bg/uploads/file/22233226952.pdfIn PDF document text
    • http://kbcsisa.com/upload/fckeditor/file/gozimididunepug.pdfIn PDF document text
    • http://agarimo.com/archivos/archivos/jutupononedu.pdfIn PDF document text
    • http://www.msjcongregation.org/www/js/ckfinder/userfiles/files/68313693590.pdfIn PDF document text
    • http://reylab.com/userfiles/file/rasenezuweduseko.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/1303077331.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137ab3db6a51---84849273828.pdfIn PDF document text
    • http://baracenter.be/userfiles/file/boteman.pdfIn PDF document text
    • http://tokyo-sanritsu.com/userfiles/file/faxovitekawekopudowowixu.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613d8b3bd6045---75751949215.pdfIn PDF document text
    • http://hongdacable.com/d/files/mizoketo.pdfIn PDF document text
    • http://geerhannutpourreussir.be/docs/upload/files/74741062627.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1613369a55a9a7---galironoxediwowupiwepo.pdfIn PDF document text
    • http://pinedafoundation.org/imageuploads/file/zirutuvovisiwafufirin.pdfIn PDF document text
    • https://aqua2go.pl/galeria/file/walaworu.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/10c74d4a5791de76d5bc23c1408146f1/44404663105.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16139271696351---mozebesezepavexukamije.pdfIn PDF document text
    • http://sprinter-lab.ru/content/File/74188733749.pdfIn PDF document text
    • https://siahotel.com/userfiles/files/36474636499.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/53681a56d31892157dda5332be0b8fe4/21008399306.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_off0000e8fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8FE 17800 bytes
SHA-256: e79016e35ac648430bdbcac4aec051ad853dc0584578a2321691af845df687a5
font_01_sfnt_off0001170d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1170D 10372 bytes
SHA-256: 911e091c9f1ea628140dea92ff1434f20c55eafb2bbab46a67dadc0ea1f4bb4c
font_02_sfnt_off00012e2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E2D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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