Malicious PDF — malware analysis report

Static analysis result for SHA-256 d99850c0dcea34e6…

MALICIOUS

PDF

91.8 KB Created: 2021-07-29 17:03:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 04b68eac964c8fbe2362eff9b7e74d9a SHA-1: 86bb5f1c958239378dc8b76d38187f09f3309a0f SHA-256: d99850c0dcea34e6c07bd52187d40890cdace87cf746178abe80311ff1d99072
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 hosting other PDF files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of link farms on compromised CMS uploads suggests an attempt to obscure the true destination and leverage potentially trusted domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160811e2e66e98---zademejaribus.pdf In PDF document text
    • http://feach.ie/images/uploads/file/vexevi.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e8742cca745---50898017472.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/70506ff6d04c1418db823d7bcc1cb503/kopazozewinodojozuzededu.pdfIn PDF document text
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a458c7fd76---rukivikumi.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/wukikekilojibolaxeja.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/lowexijumakusamid.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608ef73985e69---78607397377.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/25a257e0a032ddd3a9f3559e14c395d2/fisukoruxaligurux.pdfIn PDF document text
    • http://dichvugiayphep.net/hinhanh_fckeditor/file/41060315954.pdfIn PDF document text
    • http://firewheels.pe/userfiles/file/71079948557.pdfIn PDF document text
    • http://fitnessklub-impuls.pl/uploads/assets/file/97080051709.pdfIn PDF document text
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/3815b4a3b5b492e4d88005b7a86148af/zonotilu.pdfIn PDF document text
    • https://people11people.com/uploads/File/91397007904.pdfIn PDF document text
    • http://asiadomainstore.com/userfiles/file/kofixezuzuvewaroxetuxakuz.pdfIn PDF document text
    • https://makiriaszto.hu/ckfinder/userfiles/files/vofomaxomonosakaxasipas.pdfIn PDF document text
    • http://esthebel.de/userfiles/file/56728903877.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7ee609facb---77595918632.pdfIn PDF document text
    • https://cochleartudaskozpont.hufiles/fuvibubifo.pdfIn PDF document text
    • https://southernlightingsource.com/wp-content/plugins/super-forms/uploads/php/files/c7ef777ba54dc79fcadbfcf25a391ab9/82254219664.pdfIn PDF document text
    • https://506hlapeta.com/files/file/57332155647.pdfIn PDF document text
    • https://www.gasserbush.com/wp-content/plugins/super-forms/uploads/php/files/2f9c008a274ea1225ad3d24309e2f87b/popoxepikodifepiwibuj.pdfIn PDF document text
    • http://skolicka.eu/foto/images/file/xudilixir.pdfIn PDF document text
    • http://laclonghotel.vn/upload/files/38553932688.pdfIn PDF document text
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/roxokesewewemivuz.pdfIn PDF document text
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/e4cafc57b9a4081391861dc5f7672e1b/76114702024.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=the+courage+to+be+disliked+how+to+free+yourself+change+your+lifePDF 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_off0001015e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1015E 11252 bytes
SHA-256: 797d33989c3c504b888e8cf2d55859a76f079abc46151a0637a75e588c0aeac8
font_01_sfnt_off00011b99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B99 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000133ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133AB 17120 bytes
SHA-256: f213fee069c148f968ebf89495c3f66e0c67ac5882703435dd4a55169a06452c