Malicious PDF — malware analysis report

Static analysis result for SHA-256 f47fe9a72e432231…

MALICIOUS

PDF

74.9 KB Created: 2021-09-01 10:47:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a0273869ab455327fab82fdb52b8954a SHA-1: 2823895554da363f525e2b95ec26b215688087ed SHA-256: f47fe9a72e432231b6371ca90547a15e5c0b60b2222354a587a85a8d74526ce5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm with numerous URLs pointing to compromised websites and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the nature of the link farm and the presence of external URIs suggest it is designed to lure users to malicious content, potentially leveraging embedded JavaScript for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://taxilitomerice.cz/ckfinder/userfiles/files/raroxosu.pdf In PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/2bdloq8rvgkd4tk5o7su1a9akk/64598995769.pdfIn PDF document text
    • http://top1np.com/ckfinder/userfiles/files/94989076799.pdfIn PDF document text
    • https://nhatngudongkinh.com/upload/ckupload/files/47143861463.pdfIn PDF document text
    • http://ontis.sk/editor_uploads/system/files/xoxuvabubupefovixona.pdfIn PDF document text
    • http://pandoreunion.com/clients/81456/File/fapevur.pdfIn PDF document text
    • http://tofuyatogo.com/uploads/files/17108935694.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/dmtj9tekm57898qdmjlt0c0hf1/15048100208.pdfIn PDF document text
    • http://changwontour.kr/FileData/ckfinder/files/20210709_9AF9180440E35B73.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/1607309356e4ea---49744901599.pdfIn PDF document text
    • http://targhevaticane.it/userfiles/files/27555747696.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/32e6e68586b491d83c1b0fbd86b7a3bc/jinoxudetagi.pdfIn PDF document text
    • https://btcauction.vn/hinhanh/file/46243194386.pdfIn PDF document text
    • https://samowar.me/userfiles/files/98088367149.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/38457734799.pdfIn PDF document text
    • https://kochitaxirental.com/ckfinder/userfiles/files/48959738522.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/rvlsi9bfu7j0ie4uodi6s5p1u4/46584451278.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/58081116020.pdfIn PDF document text
    • http://kleinschaden.expert/userfiles/file/rulowejixulowu.pdfIn PDF document text
    • http://woodwork.pl/ubezpiecz/obrazy/file/gujewatunojovafotunu.pdfIn PDF document text
    • https://gppacdatabase.net/userfiles/file/32298179688.pdfIn PDF document text
    • http://lapawan15.com/shop/fck_file/file/63387155155.pdfIn PDF document text
    • http://clinicaveterinariaalbese.eu/userfiles/files/tojakina.pdfIn PDF document text
    • http://terredellamagnagrecia.com/userfiles/files/rekidamapudutidipar.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=numerical+analysis+9th+solution+pdfPDF 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_off0000bdbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDBD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d5cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5CF 17896 bytes
SHA-256: a6027d0bf36461d658d9afe0375fbef1105260a896a1a0fba850e2a5b24a15cf
font_02_sfnt_off00010435.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10435 11244 bytes
SHA-256: cb31b05cfafe4d89a586f1984dd74d1fd099d9cbaefafe49d96ae0d491bfb31d