Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6a17b1998b1c3f0…

MALICIOUS

PDF

70.2 KB Created: 2021-09-25 10:50:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: bff48eebac2dce866d1c83b0f24b72d5 SHA-1: b2ea0d7c2ca7104064f01e8547e60997f0bed950 SHA-256: d6a17b1998b1c3f072048ac297705ef88a0f2855d9140419b9c907f2c07d3f1e
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs that point to compromised CMS upload storage, likely serving as a distribution point for further malicious content. The presence of these links suggests an attempt to lure users to malicious sites, potentially for phishing or to download additional malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161466a63af308---sebupivenikukusujim.pdf In PDF document text
    • https://pottoka.info/files/galeria/files/50508566458.pdfIn PDF document text
    • https://ever.dacola.com/upload/files/demewuterugaxu.pdfIn PDF document text
    • http://artdealer.vn/upload/fckimagesfile/9c9934ac24894f543e63ef90a932fe11.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612f28066f231---digujudemavodesolisa.pdfIn PDF document text
    • https://dimensioninteractive.com/WYSIWYGImage/file/91859668578.pdfIn PDF document text
    • https://truckforceone.com/upload/editor/file/xutol.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138b6e0f10ef---62480751154.pdfIn PDF document text
    • http://chrislahoda.ca/userfiles/file/sejijevuz.pdfIn PDF document text
    • http://doudou.tw/userfiles/files/20349790673.pdfIn PDF document text
    • https://sofanet.ro/ckfinder/userfiles/files/45327567837.pdfIn PDF document text
    • http://potlista.com/file/files/2812218058.pdfIn PDF document text
    • https://diarch.in/WYSIWYGImage/file/lefad.pdfIn PDF document text
    • http://tlxzkj.com/uploads/file/160121057549.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/b34dd97f6d79c532f5fe9616f42e7f35/zulenudofu.pdfIn PDF document text
    • http://nedvizhimost-v-sharm-el-sheikhe.ru/uploads/files/rozide.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1613b8dd3ccc45---dagojediwawopu.pdfIn PDF document text
    • https://jaukiaplinka.lt/ckfinder/userfiles/files/gegudebivo.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1614ce3b628f97---40020112597.pdfIn PDF document text
    • https://megashina24.ru/files/files/tamomaginivagoxida.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/7iej30t60ngi5q5hktmqsgnpap/91849861284.pdfIn PDF document text
    • https://windfreeklima.com/upload/ckfinder/files/vodujamuredobuwuwunegu.pdfIn PDF document text
    • http://aygroupmuh.com/image/files/tubojipaxige.pdfIn PDF document text
    • http://www.plain-pied.com/editeur/ckfinder/userfiles/files/reperipikopokakuro.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/38b7964a8589c88deb054191a0137c61/1298303013.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=sky+force+reloaded+modPDF link annotation
    • 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_off0000b525.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB525 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cd37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD37 15372 bytes
SHA-256: 1ab0f662005b5bb30d570ea2a83140de9043993b479a5655962a59b9dcc6bd32
font_02_sfnt_off0000f34a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF34A 10456 bytes
SHA-256: 3c721bcf644dc80fe2d4888a96874bb23c4036e3828f80d7beffd5b47574110f

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