Malicious PDF — malware analysis report

Static analysis result for SHA-256 be8a4e31080ed617…

MALICIOUS

PDF

85.2 KB Created: 2021-06-29 19:10:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 69fa356ff79290ce6624a009b30cdbde SHA-1: 801c25b8d4fea464bea3b48303677f2d75972b19 SHA-256: be8a4e31080ed6175458b8fae46864d07dbde9c3df0cad43949f12a950a7ae8b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting, suggesting a phishing or malware distribution scheme. The presence of external URIs and link farm characteristics strongly supports a malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://vo23.ru/upload/file/14890016329.pdf In PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fe0d98a672---14185143197.pdfIn PDF document text
    • https://africanresearchcenter.com/userfiles/file/92945270748.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/2aa23f82bf5872ded86d6e7911bc2dbd/ditekonugosonokodobozeku.pdfIn PDF document text
    • http://ourhkg.com/UPFILE/userfiles/files/wikelerogenowilido.pdfIn PDF document text
    • https://grupo-bahia-real-estate.com/ckfinder/userfiles/files/49053922648.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bfbd690875---91843003213.pdfIn PDF document text
    • http://qtjdb.com/UploadFile/2021/05/12/file/20210512_122556_140.pdfIn PDF document text
    • http://mg001.cn/upload_fck/file/2021-5-10/20210510021916195508.pdfIn PDF document text
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/16c95bc254083d7c5ac4c6359b2be09a/kalivefow.pdfIn PDF document text
    • http://dzwigipoznan.pl/userfiles/file/jekafenepelogelavax.pdfIn PDF document text
    • http://waukeganeast1980.com/clients/877304/File/85621100465.pdfIn PDF document text
    • https://anfauglir.com/images/file/zenibipudibelatinupi.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/vhfmceftghm61sfo5bchgpjdd0/12079172678.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f306e84552---tejinibubunifa.pdfIn PDF document text
    • https://biothiennam.com/media/ftp/file/4402184622.pdfIn PDF document text
    • https://grandhotelbulgaria.com/userfiles/file/zirenodenateraxejixebubon.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/e47f332ad298934df15d834ec8b5deaa/ruwumixivenadarexelavamuf.pdfIn PDF document text
    • https://lightingsystemscol.com/wp-content/plugins/super-forms/uploads/php/files/1454d45671a7bf126d50079179e363b2/mujisuze.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc7c8f14e4---42962870175.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160879662030d9---pumosagegoxiguluwujinu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=11+letter+words+beginning+with+cPDF 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_off0000e977.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE977 17524 bytes
SHA-256: 2365975ad57ad8b192556a8e27af2546f6319f35093f24159114d8acaa1caf51
font_01_sfnt_off00011756.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11756 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012f6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F6D 10668 bytes
SHA-256: 73da098119cf07b87588bb0124b971d5062ecfaa400023112c1a15a7e66fbe21

Open this report in the interactive analyzer, or submit your own file for analysis.