Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a01ffca599bca8b…

MALICIOUS

PDF

82.0 KB Created: 2021-07-18 01:16:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3bc50cea2ab10ab73df354b941d86a71 SHA-1: 51ac49883c34f6205673d112d9299a4432cede63 SHA-256: 1a01ffca599bca8bcfd15fa3aa711c5100d6c5afd90d4efb575488a57f3d6559
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to compromised CMS upload storage and disposable hosting. These links are likely used to distribute phishing content or further malware stages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af9957a5448---40748717363.pdf
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160d8722e3ea2e---ruganelubixapetudabefuku.pdf
    • http://vattucongtrinh.com/userfiles/file/paxaketesevemeja.pdf
    • https://directorvincentchow.com/fck_filemanager_upload/file/rinetejoxu.pdf
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/hednum0qlsovoi1k30ng4dhao3/90423917690.pdf
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/v86rg5g5cncpt0bv58iedtp7h5/60224438866.pdf
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160852ee645bc9---40113226468.pdf
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/3fcf1f3e7cc79ba7e1e6a94e7a4f7380/bajoronimadusijasoruz.pdf
    • http://clasesholandes.com/userfiles/file/vojodifixonawatume.pdf
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b2b256977e0---liwade.pdf
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/55ef65bac2d8b602f046450910882526/popuxijivazeporawopo.pdf
    • https://almuhja.net/ckfinder/userfiles/files/61590079838.pdf
    • https://bem-sa.com/img/file/detituxesikojubes.pdf
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/8dbosm5bva9a0muntljfj5mcgu/patopilurijeger.pdf
    • https://allmassage.net/upload/file/20210510091616.pdf
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609238d3f03f4---97762069235.pdf
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160866c537e896---nuwenuranetidifufosi.pdf
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074d79b2f6e1---67388735758.pdf
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16093c5e264655---34436445511.pdf
    • http://aklond.com/UploadFilesfile///2021050401120339.pdf
    • https://indobaliart.com/sitefiles/file/bagedefiv.pdf
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ab15c5340e5---49037302261.pdf
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d202017db50---pabedeganifam.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=state+route+marker
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e1a5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE1A5 16792 bytes
font_01_sfnt_off0000f9b7.bin
d28846e2e01d807a5842664d54b8d859399cb813bb64178cc4ce1501dca14e71
pdf-font-stream PDF embedded font (sfnt) at offset 0xF9B7 16432 bytes
font_02_sfnt_off00012433.bin
165e14483fb9934c7ffac3f546ccf914fb9fdbb2aa140fe2d32267875a3de5c2
pdf-font-stream PDF embedded font (sfnt) at offset 0x12433 10124 bytes