Malicious PDF — malware analysis report

Static analysis result for SHA-256 56f00612ba50f7b5…

MALICIOUS

PDF

84.7 KB Created: 2021-09-07 01:47:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f7872fd51b83c79e993bc55bf143b7b4 SHA-1: 8f1d0e98dbb4ca69a6bc2d49b2a8fdd286a78875 SHA-256: 56f00612ba50f7b5fe7dcd3122ab3268da30f57a7ac6c66e9de8ff7b77bc2b9e
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, indicating a link farm designed to distribute malicious content or phish users. ClamAV and ML classifiers strongly indicate maliciousness, with the PDF_SEO_DISPOSABLE_LINK_FARM heuristic confirming the nature of the link distribution. No scripts were extracted, but the presence of multiple external URIs and compromised CMS upload links suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/ddvr73tonvkcheirqjrflnmm01/metiposebuvuv.pdf In PDF document text
    • http://prvugkh.ru/uploads/files/wibusesurokiparunu.pdfIn PDF document text
    • http://sireny.net/share/files/korovijimesetek.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/au3p6rfv9tc8d41legb3g6sk04/42899564377.pdfIn PDF document text
    • https://pasarantogeldua.com/contents//files/16534253818.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071001e0b537---45260488030.pdfIn PDF document text
    • http://panda-es.tokyo/yamituki-n/uploads/files/13504258984.pdfIn PDF document text
    • http://hongshengfish.com/uploadfiles/2021060408312461533.pdfIn PDF document text
    • http://marcobernini.it/userfiles/files/tiwusigozitagowimixexiki.pdfIn PDF document text
    • http://csc-0898.com/userfiles/file/20210719041945_5vpvkj.pdfIn PDF document text
    • https://swagath.co/new/ckfinder/userfiles/files/70271266476.pdfIn PDF document text
    • http://agavietnam.com/img/files/wawis.pdfIn PDF document text
    • http://nusamulticentralestari.com/Uploads/userfiles/files/57359773115.pdfIn PDF document text
    • http://donghobaoan.com/uploads/files/17006384203.pdfIn PDF document text
    • http://all-pass.com/folder/editor/file/totusuxezanowukijerub.pdfIn PDF document text
    • http://verduciautodemolizioni.it/userfiles/file/36090370838.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/6d040d6f171cd5311c513bf76bd15727/bififupixek.pdfIn PDF document text
    • https://mosallaesf.ir/uploads/ck/files/81909500587.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/16086e65beb8ac---35853651165.pdfIn PDF document text
    • http://eko-inwest.eu/upload/file/91593859103.pdfIn PDF document text
    • http://sinocelltech.com/filespath/files/20210809175805.pdfIn PDF document text
    • https://promise-land.com/upload/file/4598095660.pdfIn PDF document text
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/ua8jgvj4077cm1onj254m9jii4/xupawa.pdfIn PDF document text
    • http://knshzj.com/CKEdit/upload/files/xilufowapitaforopabedelar.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160885eac459a9---75388584539.pdfIn PDF document text
    • http://banghetretruc.com/media/ftp/file/99390214620.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=manual+wheatgrass+juicer+stainless+steelPDF 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_off0000e2bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2BC 19064 bytes
SHA-256: a36ce9d08c8f8252efee548cfe89386ae38fe664f7a5fd540e6d652ae171fb04
font_01_sfnt_off000113fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113FC 10696 bytes
SHA-256: b56c62afe8e4abf226a8cc463670091762fdee13509593b4d7bd3c261bf35904
font_02_sfnt_off00012c80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C80 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1