Malicious PDF — malware analysis report

Static analysis result for SHA-256 a501c7416070c688…

MALICIOUS

PDF

80.8 KB Created: 2021-09-17 10:31:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: bdb45c00c3df4effc0785ea1dd60f9e6 SHA-1: 8cbb67bc0c09e42a6639dd1ecd46e479de839060 SHA-256: a501c7416070c688e04a268fd0a9508717617e2e01f4a497c47dd14d4c5cbef0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ClamAV and an ML classifier, and contains numerous embedded URLs. These URLs point to various domains, many of which appear to be compromised or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of these links indicates an attempt to lure users into potentially harmful content, consistent with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://huntic.ru/uplcv?utm_term=lucifer+watch+online+free PDF link annotation
    • http://gsnursing.in/ckeditor/ckfinder/userfiles/files/worijevixanezamita.pdfIn PDF document text
    • http://cjmfgxfollow.morefriendship.com/upload/files/bivitelujuz.pdfIn PDF document text
    • https://kueapem.com/contents/files/41394459785.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/89837748999.pdfIn PDF document text
    • http://www.almansori-ye.com/almansorifiles/files/40421246294.pdfIn PDF document text
    • https://fablab808.com/nbloom/fckuploads/file/16944150529.pdfIn PDF document text
    • https://marathonroller.com/userfiles/files/sibogexufajifowukod.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613041c94031f---nutef.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/ad16230fad6d08812b1c07e42f819221/92375251548.pdfIn PDF document text
    • https://claudiodituri.it/uploads/xelizedajefejev.pdfIn PDF document text
    • http://3asoft.vn/img/files/liniduliworewam.pdfIn PDF document text
    • http://zsdbiopharm.com/upload/files/53396406172.pdfIn PDF document text
    • https://satuldelut.ro/ckfinder/userfiles/files/48464926627.pdfIn PDF document text
    • http://nhadatv.com/webroot/img/files/fuvosuza.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/16138b917b583c---24440241915.pdfIn PDF document text
    • http://novo-foto.ru/ckfinder/userfiles/files/80531307147.pdfIn PDF document text
    • http://pincailight.com/zk/UploadFile/file/2021090609075273499.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16134ff30e3b23---95357572715.pdfIn PDF document text
    • http://anthonyjcincottalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jikijelodevikijexepis.pdfIn PDF document text
    • https://xn--90aoja6ahg5ds.xn--p1ai/uploads/files/dudid.pdfIn PDF document text
    • http://allamericannursing.com/userfiles/file/12756453981.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_off0000d831.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD831 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f043.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF043 17844 bytes
SHA-256: 9b3aa3b736c5ceda15e1948d221d45023d384e1ad1fa0329d6a0026c404b4b76
font_02_sfnt_off00011e6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E6D 10408 bytes
SHA-256: 89f5721b785a93907828abc7e6f6688fcc8a939fab83a5bad9f452591e682de3