Malicious PDF — malware analysis report

Static analysis result for SHA-256 69626485118eccf6…

MALICIOUS

PDF

81.9 KB Created: 2021-09-17 21:52:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 87f20c2918c6a04c0f3bbc0062363b29 SHA-1: aa6b8dbee6e292c7f3afc5adeec1de1d7c36666e SHA-256: 69626485118eccf6c0e3b38679bf88469ad629ce693e14f4c097354f5c7f9f4d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, specifically phishing. While no scripts were directly extracted, the PDF structure and embedded URIs are consistent with techniques used to deliver phishing lures or redirect to exploit kits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://queure.ru/uplcv?utm_term=outlook+sign+in+mail+live PDF link annotation
    • https://namhunglogistic.vn/site/files/78471058658.pdfIn PDF document text
    • https://www.abrasco.org.br/ckfinder/userfiles/files/76498440044.pdfIn PDF document text
    • https://nenmongdangquang.com/upload/files/komovozog.pdfIn PDF document text
    • http://zensushialiso.com/uploads/files/32163220791.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/16138ad92c06be---wepologuwunima.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/10130512734.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613e79c958b03---xeruvatoxuviruzomibupod.pdfIn PDF document text
    • https://anpheatingandac.com/nbloom/fckuploads/file/26528807334.pdfIn PDF document text
    • http://alda.pl/ckfinder/userfiles/files/zasodunemowedotezewe.pdfIn PDF document text
    • https://drbumbnursinghome.in/ckfinder/userfiles/files/xumudanobaduwozu.pdfIn PDF document text
    • https://omegaplus.bg/uploads/pages/files/10734271469.pdfIn PDF document text
    • http://xn--365-pn7mwb654m2qn.com/ckupload/files/62142821082.pdfIn PDF document text
    • http://dienlanhtruongson.com/upload/files/65700546966.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/0410eca704913fd40c96e69ad40b5ea7/duxakasirusukodojo.pdfIn PDF document text
    • http://support-cmu.com/filedata/file/90307983319.pdfIn PDF document text
    • https://kasihpaham.com/contents/files/46424572896.pdfIn PDF document text
    • http://insei.eu/userfiles/files/lonuz.pdfIn PDF document text
    • http://bugaboo-buffalo.eu/UserFiles/File/wowem.pdfIn PDF document text
    • http://quangcaovuanh.com/vietkiendo/upload/file/pejopiziragigavun.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161415f090e8a3---pedal.pdfIn PDF document text
    • https://taxfirma.com/userfiles/file/49954115425.pdfIn PDF document text
    • http://trubaopt.ru/content/file/55708480974.pdfIn PDF document text
    • http://pngroup.pl/ckfinder/userfiles/files/78925266435.pdfIn PDF document text
    • http://ty6600.com/userfiles/file/75114143087.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_off0000da12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA12 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f224.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF224 18440 bytes
SHA-256: 7a69674824825ad9a13f2b06d7b575d3262ff355fd1565f42252f45a7e968c0c
font_02_sfnt_off00012196.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12196 10636 bytes
SHA-256: 82673c7b134d081fe53587604b26f62a791735d305a17ffd9594f3085a939c13