Malicious PDF — malware analysis report

Static analysis result for SHA-256 617dad2b4c9ba771…

MALICIOUS

PDF

106.8 KB Created: 2021-08-07 05:22:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 087a0f9cdc515fbe28ade37e4a6aef0a SHA-1: 3d61cbab741f8c8983a7962cb992245fbf3bfabf SHA-256: 617dad2b4c9ba7714401dc12765b7fa673633a7eea8fdfaf1cf7bc89e5eff96b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many of which point to compromised WordPress sites, suggesting a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The file's structure as a link farm on potentially compromised hosting is a common tactic for distributing malware or leading users to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1610d98d43596e---zifoxitozidamojef.pdf
    • https://ecoverservice.be/gallery/file/57234996397.pdf
    • https://couvreur-hautdoubs.fr/internet_new/images_et_fichiers//file/papagepigusosalabadefef.pdf
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1ba06957d4---zebisirisunenulutiki.pdf
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/r43tone6qjuge67e7afg1dog33/punokawaruxum.pdf
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1609dba165a8a2---76959047057.pdf
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/19570c9fd4de7ab025ff427ce99042cc/xexuvorekabopo.pdf
    • http://parkhighclassof60.com/clients/871169/File/33641622266.pdf
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/4944eac1e1bcf9c46a1a27296718fb46/61975507143.pdf
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e462a0dea30---39404650311.pdf
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/9893f105fb23274f1143d3c9407fedd4/nuzogipatonenekepewafusuz.pdf
    • http://kolesnikov.pro/ckfinder/userfiles/files/37622752820.pdf
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c18bb5b7221---88549093737.pdf
    • https://digireg.gr/upload/lerimavoxu.pdf
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/a66ecb1c2083734239d86e02b5146eb4/xoparawegusofereworisum.pdf
    • https://bangprice.com/bangprice.com/beta/cms_image/file/rofoweteb.pdf
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/160aa9ac61025a---seromejegikesabaxeju.pdf
    • https://sikanderajam.com/Robinson/ckfinder/userfiles/files/jipinol.pdf
    • http://bobmeetin.com/media/galleries/files/25766058853.pdf
    • http://sterenstein.ru/userfiles/file/nujurizetimigedetemi.pdf
    • https://al-wesam.com/userfiles/files/wazujobebodogorutebiboren.pdf
    • https://ecobox.eng.br/wp-content/plugins/super-forms/uploads/php/files/k829q4usl2uuf4pi3gvo253nuo/79735063121.pdf
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/16092157028fce---duxufinoludajex.pdf
    • https://aashianarealty.com/file/64186405632.pdf
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/c00730a80eae56a4499c132d01bdae5e/56145513394.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=what+is+isentropic+compression
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000121c7.bin
94babf8344da3dd5dd9c7325bc86a5b75b9a5ac56b516ca106d48bd329021810
pdf-font-stream PDF embedded font (sfnt) at offset 0x121C7 19856 bytes
font_01_sfnt_off000156ab.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x156AB 16792 bytes
font_02_sfnt_off00016ec2.bin
12207f41ebbc026116bda0458a8f08a1cff73ee47ef776ec5d978cf7fbe6813d
pdf-font-stream PDF embedded font (sfnt) at offset 0x16EC2 10584 bytes
font_03_sfnt_off000186c6.bin
34837fdfed7e6dc9e8c1ebc45eabef1064a6e89f8cd536305124148a4af1fb29
pdf-font-stream PDF embedded font (sfnt) at offset 0x186C6 16168 bytes