Malicious PDF — malware analysis report

Static analysis result for SHA-256 556bce2c1a7d34c2…

MALICIOUS

PDF

93.5 KB Created: 2021-09-06 06:51:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c0bc2a493b9f740649d49174edbc1e3d SHA-1: 00f872eafb343b7b1a6b23c6a6a3691f37d908e7 SHA-256: 556bce2c1a7d34c2ade922b2678410e6e7ca487b0d2004713b8da55748c4c40c
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external URIs and link farms pointing to various domains, many of which are hosted on compromised CMS platforms or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The primary attack pattern involves redirecting users through these links to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://philabc.ru/uplcv?utm_term=once+and+for+all+sarah+dessen+pdf+download PDF link annotation
    • https://vandolderskb.com/images/usr/mujixapirugujigefujeju.pdfIn PDF document text
    • http://guitarenko.fr/img/files/pojudematiwufad.pdfIn PDF document text
    • http://kadernictvo-svetlana.sk/editor_uploads/system/files/28908266879.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/72529694040.pdfIn PDF document text
    • https://oksushidelivery.cl/sitio/public/files/file/jokixuwekamaguzanajoxi.pdfIn PDF document text
    • http://itineraire-consulting.com/ckfinder/userfiles/files/taravolikoxaneduxo.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b514b9e20a2---57523457908.pdfIn PDF document text
    • https://tedvandergulik.nl/userimages/file/dogonitoli.pdfIn PDF document text
    • http://forepic.com/_UploadFile/Images/file/16787744822.pdfIn PDF document text
    • http://johncarroll1967.com/clients/1/18/1896e795ecc2602204d707ec4e69586f/File/98163935881.pdfIn PDF document text
    • https://ferado.vn/userfiles/file/zafamovurixakiw.pdfIn PDF document text
    • https://bulendengin.com/upload/ckfinder/files/66373950411.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/fb0ba34f4a2d4a70a24a28e29c1cce39/8259738717.pdfIn PDF document text
    • http://iccarrentals.com/files/file/3573693009.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b438435de5---punijavupiwezuka.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b21f50dd45f---25134203107.pdfIn PDF document text
    • http://melly-incendie.fr/img_db/98010620647.pdfIn PDF document text
    • http://panda-es.tokyo/yamituki-n/uploads/files/53552821040.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5d0c41cdf2---nipim.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161179211c6e7a---58838946281.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160a573720f5c4---69060709755.pdfIn PDF document text
    • http://sequirk.ie/userfiles/file/gekekasoxuliline.pdfIn PDF document text
    • http://chiengthai.com/file_media/file_image/file/21768295372.pdfIn PDF document text
    • http://bmfjhjk.friend-match.com/upload/files/6546383874.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/8bdsui3c725elugnkb5lh3fsq2/mikujozijajuvunimizimorup.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000107b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107B6 18376 bytes
SHA-256: 319fc7a8ad30f146d49e68193f326582b0b21ea70c5ebdaf8459fe0b01effb11
font_01_sfnt_off00013717.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13717 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014f2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F2E 10640 bytes
SHA-256: 01c633d3c026e48e0f00cc42f2dce6ae5ac58ee962b70ebc59a5d27ec97bf8cb

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