Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd8ba1be1a2b0d47…

MALICIOUS

PDF

83.8 KB Created: 2021-09-04 11:22:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 59b724fbe65b01938c7186822b56dc5e SHA-1: 1298f0d250ded301d927dea691a60ef51c81dea7 SHA-256: bd8ba1be1a2b0d476e3394e5e5f60c5bea232d150269369ce9b2edf31e4476e7
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of external URIs and link farms points towards a spearphishing attachment as the likely initial access vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.insight-assessment.com/ckfinder/userfiles/files/diwufoxejemejok.pdf In PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/c7447122171030d01a9e1ede308d90f7/88233643062.pdfIn PDF document text
    • https://adasms.fr/userfiles/file/sokasoju.pdfIn PDF document text
    • http://minerva-collection.net/files/files/23339223111.pdfIn PDF document text
    • http://steelbo.com/uploads/admins/u0/files/20210625025047.pdfIn PDF document text
    • http://bobas24.pl/Upload/file/wemosagesemijej.pdfIn PDF document text
    • https://paroles-vives.com/ckfinder/userfiles/files/pepetogunesatuvibasar.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070a1902dee8---55120269619.pdfIn PDF document text
    • https://adikkedua.com/contents/files/rikeruku.pdfIn PDF document text
    • https://pypconsultores.mx/userfiles/file/21003635665.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/h7ks4kejuo11315hqdcvb1lb07/dukotup.pdfIn PDF document text
    • https://safe-international.com/userfiles/file/tijalinovimo.pdfIn PDF document text
    • http://wildpflanzen-planung.de/file/voxudilomerewoden.pdfIn PDF document text
    • https://curvy.tw/upload/files/12018236796.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b120ec3dfc8---powalamuzogififumo.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/qokp2u1lp6kqp690c6elir24c4/75686130062.pdfIn PDF document text
    • http://orderkai.com/uploads/files/nunuwexuridu.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/a5371a7feeb32c741ea7381351374e2e/bovorijevajovaxumo.pdfIn PDF document text
    • http://fewo-spreewald-schoetzigk.de/brandenburgtag/img/editor/file/54724161299.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/51966298394.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/ce907k3afptkupc8d0e241b274/penajibegamol.pdfIn PDF document text
    • http://www.hzkontejnery.cz/ckfinder/userfiles/files/32722789972.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/2i1uij67leak5lmr2iq6740871/40149461437.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/rmv1tmjcbupf3bpr7u0cuvdals/52861384415.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16132d8f95cdbd---12778376362.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=java+language+pdf+free+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e2b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2B1 10560 bytes
SHA-256: 63c67b6e55a18cbe718f55d6af07356387ca931a6f310d7c6435657b5b5dec84
font_01_sfnt_off0000fab3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAB3 17916 bytes
SHA-256: 65d2e247da37fd7cc0ab1d53d7194feb686730afa92a07272200a7d437e13262
font_02_sfnt_off00012939.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12939 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.