Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cc092cb1aea2bff…

MALICIOUS

PDF

81.1 KB Created: 2021-10-23 05:28:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 3bcbe9c05b1d37b5a5a6822b240c0e88 SHA-1: 0e172b6efc5fd49a14286bb8784c135d7e2cf92f SHA-256: 4cc092cb1aea2bff21a1f2692d4c393019c9b4a324b5fd7193fadb5c6ebbe919
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document functions as a link farm, directing users to multiple distinct, potentially compromised domains. The presence of numerous embedded URLs, many pointing to disposable hosting or compromised CMS uploads, strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://campbellelectronics.com/uploads/64754870860.pdf In PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/40ee458a8c1c03640966b60b1cb95434/18899707745.pdfIn PDF document text
    • http://abwva.com/uploads/files/seritewanajesu.pdfIn PDF document text
    • https://fertilizerproductionprocess.com/d/files/12949370029.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1615a4bac4577e---98280776189.pdfIn PDF document text
    • http://grafiport.com/userfiles/file/94440356843.pdfIn PDF document text
    • https://hotelindigha.com/FCKeditor/file/50542243756.pdfIn PDF document text
    • http://yljczl.com/uploadfile/20211001190115926.pdfIn PDF document text
    • http://hiroi-es.info/yamituki-n/uploads/files/3274771702.pdfIn PDF document text
    • http://pr-jam.com/ckfinder/userfiles/files/pofita.pdfIn PDF document text
    • https://asset-books.com/userfiles/file/30929320302.pdfIn PDF document text
    • http://studioambienteterritorio.it/userfiles/files/xozofemelafog.pdfIn PDF document text
    • http://srihemkuntschoolint.com/slbdavbatala/userfiles/file/37098386841.pdfIn PDF document text
    • https://manenshop.com/upload/files/mokokadomujiwijowixebono.pdfIn PDF document text
    • https://truckforceone.eu/upload/editor/file/zolisalazelad.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/161300b40dd4ce---21900707684.pdfIn PDF document text
    • https://doitoutdoorz.com/file/OVftrXTrHXHuFuHg.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/6a50fab51528efea4dc0e4b7e288670c/88280886505.pdfIn PDF document text
    • https://thietbiotoviet.com/Images_upload/files/90450683478.pdfIn PDF document text
    • http://about-dogs.ru/upload/file/55327005554.pdfIn PDF document text
    • http://ibrahimalsada.com/pics/file/42226041404.pdfIn PDF document text
    • https://sharjahcements.com/images/bulk_images/files/soxesubilipuzof.pdfIn PDF document text
    • https://egca.fr/userfiles/file/7518275536.pdfIn PDF document text
    • http://mezon.jp/userfiles/file/medozixo.pdfIn PDF document text
    • http://snnet.kr/board_pds/fckeditor/2021/10/file/26237125488.pdfIn PDF document text
    • http://meghdoothsuzuki.com/uploads/fuwux.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/Z3ufxtS7Wvw/uplcv?utm_term=best+quotes+brother+and+sisterPDF 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_off0000d913.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD913 17476 bytes
SHA-256: 6a141a317f0f0b59955c3a117d1f4c06d7bc9d5026c085703c8ebb8560b8e5e9
font_01_sfnt_off00010604.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10604 10740 bytes
SHA-256: 8eb948b33f285e17017c4281d6b21ac1bcbe451f3fd15c5637614f3c818ddb09
font_02_sfnt_off00011e74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E74 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1