Malicious PDF — malware analysis report

Static analysis result for SHA-256 05eb37d3f58691f0…

MALICIOUS

PDF

83.4 KB Created: 2021-10-07 16:27:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 8542ce3799a544d3ccb22285db8397e9 SHA-1: f14476df2fa96a2368da1bde37f948b8b6107dff SHA-256: 05eb37d3f58691f003176000296b49c721d38193d1af2fa0e7c0deedcb2cfa93
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised CMS upload directories, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, and the document body was unreadable, so the primary attack vector is the collection of malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613d97ecbbc5f---32555562279.pdf In PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/6a4728d3189c329c04704b810b51d7b4/bebafiguxefileritan.pdfIn PDF document text
    • https://xn----7sbeo1acdy3adh.xn--p1ai/userfiles/file/kuwajosawabuga.pdfIn PDF document text
    • http://benetalent.com/upload/files/zuxodisuzener.pdfIn PDF document text
    • http://shinhwajudan.com/userData/board/file/16818858318.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/16148e5663952a---17011788033.pdfIn PDF document text
    • http://lumieretvie.com/userfiles/file/77904321365.pdfIn PDF document text
    • http://hejia-ele.net/upload/sibegixo.pdfIn PDF document text
    • http://businessdevelopmentcenter.pl/uploads/userfiles/files/vikoviwiwalaw.pdfIn PDF document text
    • https://mehreganimaging.ir/images/upload/files/devavepomuzesidonigax.pdfIn PDF document text
    • http://dfwsedan.com/nbloom/fckuploads/file/7145517306.pdfIn PDF document text
    • http://arniuniversity.in/ci/userfiles/files/93564186196.pdfIn PDF document text
    • http://orderleesushi.com/uploads/files/lonofomizejilofubepa.pdfIn PDF document text
    • https://ooo-kenk.ru/userfiles/file/suduwefobiroguwudavid.pdfIn PDF document text
    • http://yearbookplus.com/uploads/ckfinder/files/59119682066.pdfIn PDF document text
    • https://ewt.cz/res/file/75590297519.pdfIn PDF document text
    • https://stcc-sa.com/motakamel/Ups/files/vebinezimelipavosew.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/ndthrtrhkvmu1l0lre9jqo6sdq/13322120475.pdfIn PDF document text
    • http://logtech.cz/foto/Image/file/kedudigutatoz.pdfIn PDF document text
    • http://henzefashion.com/userfiles/file/34715867640.pdfIn PDF document text
    • https://2winit.com/Files/files/57195188801.pdfIn PDF document text
    • http://multi-accueil.fr/ressource/site-image/files/33179206748.pdfIn PDF document text
    • http://ccshecea.org/upload/files/pagobopolalezimar.pdfIn PDF document text
    • http://thermogroup.ru/uploads/files/2957772747.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=quick+food+recipes+for+dinnerPDF 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_off0000ddd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDD3 10556 bytes
SHA-256: 424c0845d288fc94b7c8eae981fc7759fc7979baf11fe9c4e369dad8b9b3e846
font_01_sfnt_off0000f60d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF60D 19540 bytes
SHA-256: bfbb45765a2f982bc01b78011ed62496530f461216a919f91aafb2ef4ceae776
font_02_sfnt_off000127fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1