Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cde01aab61f0b5d…

MALICIOUS

PDF

71.3 KB Created: 2021-09-18 05:06:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7baff7072d4472b7ba35071dbd26fce4 SHA-1: ed9171edfafa61f414eb4ecb3bc5e96bfddafd0f SHA-256: 1cde01aab61f0b5d0165f82ffb217c3449f38c868aa9f8fad729c459160ee895
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to distribute malicious content. ClamAV and ML classifiers also flagged this PDF as malicious, supporting the assessment of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://wsospice.org/uploads/userfiles/file/file/69758380930.pdf In PDF document text
    • https://pacpartner.net/images_client/imagesfile/75759312037.pdfIn PDF document text
    • http://imhkayseri.com/resimler/files/mozibalopowejirerunu.pdfIn PDF document text
    • https://gegeny.hu/uploads/file/87127148217.pdfIn PDF document text
    • http://hadt.vn/upload/files/12301643177.pdfIn PDF document text
    • http://rentator.com/uploades/fckeditorfile/ragipirag.pdfIn PDF document text
    • http://deshdunya.com/blogimage/file/62203872773.pdfIn PDF document text
    • https://irastuff.com/admin/ckfinder/uploads/files/tapimoduromijafeb.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/161358fb490e69---56447055788.pdfIn PDF document text
    • http://specialcats.nl/media/files/tefatuzu.pdfIn PDF document text
    • https://mlmrockstars.com/ckfinder/userfiles/files/36352452712.pdfIn PDF document text
    • http://cp-1.ru/userfiles/files/30449937004.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/16140072603f62---90948898213.pdfIn PDF document text
    • http://gmkms.net/upfile_editor/2021/files/72051514673.pdfIn PDF document text
    • http://zoldjogsi.hu/uploads/files/77914220308.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613da78b9d6bf---74969583556.pdfIn PDF document text
    • http://ballarioarchitetti.eu/userfiles/files/narelesa.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613af45a9737d---gudiwejegive.pdfIn PDF document text
    • https://myvideoclasses.com/ci/userfiles/files/jesixidawabex.pdfIn PDF document text
    • https://mtmhomeschool4art.com/mycms/uploadedimages/editorUploadedImages/file/97497455051.pdfIn PDF document text
    • http://idroter.org/userfiles/files/kizodo.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/16130b3d0c3b0b---joxijetoketazik.pdfIn PDF document text
    • http://www.saletime.gr/admin/fckfiles/file/26690202936.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=paper+minecraft+morph+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_off0000b6fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6FB 10672 bytes
SHA-256: ad3094aac7e84cbf6b43f3620f5e7b0f35265a05e23a580fa569289a8ca7955f
font_01_sfnt_off0000cf3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF3B 16040 bytes
SHA-256: f43cb557fc8a738b83c0441cf9feceeb340fc6468e81e53e7a888a9822b218b8
font_02_sfnt_off0000f785.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF785 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1