Malicious PDF — malware analysis report

Static analysis result for SHA-256 181f6adeeb8bb275…

MALICIOUS

PDF

78.9 KB Created: 2021-07-28 04:42:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2b355bdf4db5be4717a42502ec49e76f SHA-1: 5af0b376fdcaa266af45f1d244b5af887cbde71b SHA-256: 181f6adeeb8bb275a53f8aada712b532eabf2d69ce800835caeff93751759618
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a link farm pointing to compromised WordPress upload directories and disposable hosting, suggesting an attempt to distribute malicious content or conduct phishing. The document body is heavily obfuscated and unreadable, providing no further context on its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/d7f6df6322518b35b1631cf72d912a8a/xedezu.pdf In PDF document text
    • http://agataklimowska.pl/userfiles/file/nudefizegawokibipijodili.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/87ea6da9b309317a86d48584f24e1036/laxugolubovugomuzinopiz.pdfIn PDF document text
    • https://nbtele.com/en/cache/fck_files/file/34167898924.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/ibugu765s2u8764087903u36ld/pafajipukuxenoli.pdfIn PDF document text
    • https://pharmawell.eu/ckfinder/userfiles/files/20759501884.pdfIn PDF document text
    • https://mobilityservices.it/file/widovavowotopenimuwopojot.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/9d806931cb71e27c9f6a3eab4fd7f640/55757263556.pdfIn PDF document text
    • http://isgsrl.it/images/file/82740461885.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077b34dd7783---7371801599.pdfIn PDF document text
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16095ada1acecf---32644656587.pdfIn PDF document text
    • https://clubslotalmatriche.com/calcas/file/89875075882.pdfIn PDF document text
    • http://greenld.com/userfiles/godupepesifutodok.pdfIn PDF document text
    • http://abwpetersburg.com/uploads/files/76186389241.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/c2e0e87620b0457883120c3b5b6d124d/33663675325.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/5p9an5o8t15lj0j37955khigq6/51208867485.pdfIn PDF document text
    • http://verypool.cn/images/upload/File/33780458215.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160823d3786156---katixapoxusuti.pdfIn PDF document text
    • https://www.hinkler.com.au/application/third_party/ckfinder/userfiles/files/30542301233.pdfIn PDF document text
    • http://clinical-pain.com/pds/userfiles/files/xoxesowinekunajubosir.pdfIn PDF document text
    • http://cosmickino.ru/sadm_files/488666.pdfIn PDF document text
    • https://ises.ca/phpsites/vertical_living/uploads/file/pijejixu.pdfIn PDF document text
    • http://ufnk.fr/app/webroot/files/file/6779474175.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=govinda+namalu+pdf+downloadPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bd45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD45 16472 bytes
SHA-256: 137bee9ca72b7ddac427e059ab340a2096e77b04af0f77b6d23da532f661fc9d
font_01_sfnt_off0000e83f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE83F 16172 bytes
SHA-256: 637a9dac0afc585f1f105c2de408df99420c2eea19216aca5c902ef31b2be0e3
font_02_sfnt_off0000fddc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDDC 10452 bytes
SHA-256: 49f615f5e41dda1e2f28808a0532950565fcde3e3d841c92ad0ef775505791c2
font_03_sfnt_off00011592.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11592 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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