Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a9b3b3964345ab8…

MALICIOUS

PDF

83.1 KB Created: 2021-09-05 16:04:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ea7ca2fc2c46c4b00d08c695c2482de4 SHA-1: 40c13cb3644c6b29926a971aec625deab899b33f SHA-256: 8a9b3b3964345ab8e3ff2d40ce4aea2e53245d5731efda1e3c7ed23218363d7f
156 Risk Score

Malware Insights

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

This PDF was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous links pointing to compromised websites and disposable hosting, indicating a link farm designed to redirect users. The presence of external URIs and link farms suggests an attempt to lead the user to a malicious site, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://xn--knstlerische-biografie-arbeit-lbd.ch/userfiles/files/tozitanezifet.pdf In PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce6752f817---gonuluxejilopitedugaxinip.pdfIn PDF document text
    • https://vokalensemble-vocembalo.ch/userfiles/file/81072733823.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/e6a6f4ea340c50d65814cc829b8788e7/makilogagegibituganig.pdfIn PDF document text
    • http://perfekttorun.pl/pliki/37391371678.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/16096cf8b89243---78653497680.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1610f7812ad688---95495767952.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160802a8b805aa---77553395465.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b253525441a---14659558908.pdfIn PDF document text
    • https://syntellect.ru/Repository/file/pafiwunodumobulefaworome.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d8f2387e84d---9084998466.pdfIn PDF document text
    • http://abbwingslynnhaven.com/uploads/files/tirepu.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/e4fa337f68e43a6b3bb06db791d2acbb/luzijiloripexiv.pdfIn PDF document text
    • https://dacola.com/upload/files/vumigupatufamurududa.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/kipeviwokivasimavu.pdfIn PDF document text
    • http://pomodorolennep.de/gfx/userfiles/files/wivuberekuvulofutafa.pdfIn PDF document text
    • http://ahdongjiu.com/upload_fck/file/2021-4-29/20210429031117604642.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16089c38e5586f---zoxoxu.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/54n5sorc33k7uk0sd2qurin6uh/xivopesolasuraxusigomojom.pdfIn PDF document text
    • http://wahibluedevils76.com/clients/5/55/55d7338a7abcce318bc847d7f34994f5/File/penaxog.pdfIn PDF document text
    • http://luxlustry.ru/img/upload/95841604479.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e15248d8125---fatakakot.pdfIn PDF document text
    • http://ylgems.com/file_media/file_image/file/fopusubapagazibaroxedux.pdfIn PDF document text
    • https://aplusadvance.com/naver_editor/data/file/lifedixemofakemow.pdfIn PDF document text
    • https://zold-kommando.hu/files/5126870432.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=letture+facilitate+per+stranieri+pdfPDF 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_off0000e16a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE16A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f981.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF981 10552 bytes
SHA-256: 0b40c9a8ee2d6d5ce2a7ae25b47af8085be056d4395fe720e022b294405c4c48
font_02_sfnt_off000111a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111A0 17336 bytes
SHA-256: 5d7cdc62caec7c757c4e1e084908fd6ba6512e0428175960023c5638248b26fe