Malicious PDF — malware analysis report

Static analysis result for SHA-256 c276da4e12863df1…

MALICIOUS

PDF

86.4 KB Created: 2021-09-17 01:13:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e048d194b6dbb0c41edb37a331e0ca18 SHA-1: 5f2fe10b3b61363e603548fcda3af4fe0321a9e9 SHA-256: c276da4e12863df1abe6428b7ffc69195de021ce3bcee66849df2623d2f45f47
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which are associated with link farms 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 PDF structure and embedded links are indicative of a spearphishing attachment designed to redirect users to malicious content.

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=juno+full+movie+free+123movies PDF link annotation
    • http://toroisg.com/public/images/files/dadisamolaremo.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/202196614501302.pdfIn PDF document text
    • http://greenhere.cn/upload/ckimg/files/202109100853573123.pdfIn PDF document text
    • http://aallergy.friend-match.com/upload/files/fenimidujekasimu.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1612f9628a8cd4---97347482974.pdfIn PDF document text
    • http://premiumdrinks.eu/userfiles/xemulipo.pdfIn PDF document text
    • http://fornacedelia.it/userfiles/files/jolan.pdfIn PDF document text
    • http://itaxabc.com/userfiles/file/20210912072304_1407837801.pdfIn PDF document text
    • http://www.valathors.com/ckfinder/userfiles/files/kujusodezodudusob.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/16787520609.pdfIn PDF document text
    • http://klhl.com/userfiles/file/kokewodanura.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/krtohedknusk6ph0ju67fvcjbt/21455142901.pdfIn PDF document text
    • http://adamex.ukrkarta.ua/fckeditor/userfiles/file/65308825577.pdfIn PDF document text
    • http://orderleesushi.com/uploads/files/4371878589.pdfIn PDF document text
    • https://strechybenesov.cz/content/15730961422.pdfIn PDF document text
    • http://bjerkelunden.org/content/files/userfiles/file///gexulelususodujazelun.pdfIn PDF document text
    • https://hantverkarenisandby.se/UserFiles/files/barulifa.pdfIn PDF document text
    • http://honyi.tw/ckfinder/userfiles/file/pajesokewepobiwodusovadep.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/1jp6vaghdo3e6opqv4fscf83g0/kiruzufawirota.pdfIn PDF document text
    • https://ud-hobby.com/images/Upload/file/nunig.pdfIn PDF document text
    • http://holzweiss.at/99051091643.pdfIn PDF document text
    • http://phatnang.com/media/ftp/file/34748571106.pdfIn PDF document text
    • http://playonathletics.com/userfiles/file/binuzekodajadedal.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613311e012ebf---kigopixuwojezutan.pdfIn PDF document text
    • http://phongkhamthienhoa.vn/images/files/54576951811.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_off0000e70f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE70F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ff21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF21 19916 bytes
SHA-256: 512c6b4027d9361b7a8aa4aeab3d3f22589c96f8869bf7801f0a435ac6265cf1
font_02_sfnt_off0001331f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1331F 10616 bytes
SHA-256: 625608f262df4a23f0d69690727e460e084205814f9d3ff1c0716428a13166ca

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