Malicious PDF — malware analysis report

Static analysis result for SHA-256 48748d760923cb7f…

MALICIOUS

PDF

80.9 KB Created: 2021-09-14 17:55:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e06b959d5626fde61da90f713e4594aa SHA-1: 6784a0060b1a870327d4b2f519985e3358e3a0b3 SHA-256: 48748d760923cb7f91a2a585fae1e5a43e4d2983b7e05dbe3bddc907cb0d21e4
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised websites or disposable domains, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The presence of multiple external URIs and link farms points towards an attempt to exploit users through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://nomylo.ru/uplcv?utm_term=mp4+player+for+android+apk PDF link annotation
    • https://sca-eagleegg5k.com/ckfinder/triplebuserfiles/file/xizufadona.pdfIn PDF document text
    • http://aotwresort.org/ckfinder/userfiles/files/fakozeziraluka.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16134ffdfed6ce---getusukusezitufamidabapar.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613e09ecc00fb---peruk.pdfIn PDF document text
    • https://linkevicius.com/upload/galery/file/37396314686.pdfIn PDF document text
    • https://csam-villepinte.org/uploads/images/file/25216708536.pdfIn PDF document text
    • http://appartementslisa.it/an3_Uploads/file/bonazawag.pdfIn PDF document text
    • http://tamtamphat.com/upload/files/65556940942.pdfIn PDF document text
    • http://uni-farm.pl/ckfinder/userfiles/files/17781170700.pdfIn PDF document text
    • http://rainhouse.kr/data/editor/file/1505076418613bb86f1ee65.pdfIn PDF document text
    • http://sinoscaform.com/upload/ckimg/files/202109041658553436.pdfIn PDF document text
    • https://glbtrader.com/userfiles/file/21799302695.pdfIn PDF document text
    • https://radiosmile.hu/upload/file/63624563965.pdfIn PDF document text
    • https://libertyrealestate.in/ckfinder/userfiles/files/mekipaxetadukanemajevu.pdfIn PDF document text
    • http://jjinline.org/file_upload/file/buzubedomajesavid.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/16140375c04070---24658463523.pdfIn PDF document text
    • http://hwangtosidae.com/userData/ebizro_board/file/93535855024.pdfIn PDF document text
    • https://vitanov.rs/files/xalulimowasuriji.pdfIn PDF document text
    • http://autovoda.ru/upload/files/35670547655.pdfIn PDF document text
    • http://stauarchitetti.eu/userfiles/files/87607568688.pdfIn PDF document text
    • http://chemonova.com/FCKeditor/file/80736620225.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_off0000d4ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4AE 19388 bytes
SHA-256: 4942bf97886f2c31bbb3ea2c9339b04b84699d660494108a16dd233c27e5e448
font_01_sfnt_off0001062b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1062B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E42 10504 bytes
SHA-256: f39c8e23a29c0aa82d48d8c7843bb06560fe8aecf91c272c24d9f8bb7af0c9a5