Malicious PDF — malware analysis report

Static analysis result for SHA-256 09b24f5a7cb07a35…

MALICIOUS

PDF

73.6 KB Created: 2021-09-19 14:07:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 51886b03e148beda609feb06a31374fc SHA-1: 3cf968125c0de460ad4d5c94a9681bf6a6950b8c SHA-256: 09b24f5a7cb07a356f1b80dcf401ac381eb9fde7a2922a48aa32c0665c81baee
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or SEO spam. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://impex-italia.it/userfiles/files/kavejolupinofoloduvazagog.pdf In PDF document text
    • http://3qlohas.com/CKEdit/upload/files/3223666705.pdfIn PDF document text
    • http://harc-ias.vn/Images_upload/files/vujidoduwezu.pdfIn PDF document text
    • http://caminodesantiagoenmoto.com/assets/ckfinder/core/connector/php/uploads/files/ditefomifatel.pdfIn PDF document text
    • http://ucg-eg.com/userfiles/file/34604520882.pdfIn PDF document text
    • https://gamepinleri.net/calisma2/files/uploads/savetodurav.pdfIn PDF document text
    • https://adikmanis.com/contents/files/fuluzigeno.pdfIn PDF document text
    • https://nirkongrp.com/ckfinder/userfiles/files/61310070996.pdfIn PDF document text
    • http://ty-int.com/files/files/povul.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff61940bbb---sonesimumodipujila.pdfIn PDF document text
    • http://ats-dz.com/userfiles/file/47446786221.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ab344cf189---91267873185.pdfIn PDF document text
    • https://www.htlexpress.com/ckfinder/userfiles/files/60470729620.pdfIn PDF document text
    • http://artechq8.com/beta/uploads/files/womim.pdfIn PDF document text
    • http://theseadiaries.com/ckfinder/userfiles/files/kazatesizigidawijapomafu.pdfIn PDF document text
    • https://arab-hams.com/Ups/files/xobixosagesitudinuwa.pdfIn PDF document text
    • http://wxdyzs.com/userfiles/files/81434548821.pdfIn PDF document text
    • https://kasihpaham.com/contents/files/gubosazuzuk.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613c5f1eea14f---fizapinogi.pdfIn PDF document text
    • http://www.elstar.ru/uploads/files/23949001768.pdfIn PDF document text
    • http://poaglasses.com/uploads/files/202109061325084147.pdfIn PDF document text
    • https://mtmhomeschool4art.com/mycms/uploadedimages/editorUploadedImages/file/54797632070.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=tubemate+apk+pro+downloadPDF 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_off0000bc80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC80 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d492.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD492 17028 bytes
SHA-256: d3b9d44c6f8b64f41facdddae030ae878257e5b95d23e48178ca105c31b8860f
font_02_sfnt_off0001005b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1005B 10672 bytes
SHA-256: df051412a98f95bd7664180b81d7e10d8a1c4c92cdbf5f7f0634120701750e8c