Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebcd3a995c410f34…

MALICIOUS

PDF

88.7 KB Created: 2021-09-01 05:03:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b28081ad3d176a7ca2a1f0405791a8a0 SHA-1: 4a56a057470d2a6c7ef95d4a381f34ea28f18ac7 SHA-256: ebcd3a995c410f342342d921ad08bd4389951a10e1d926e59c4e07a0da60456d
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by multiple heuristics, including ML classification and ClamAV detection, indicating a phishing or malware distribution intent. The PDF contains numerous embedded URLs pointing to compromised WordPress uploads and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and embedded URIs strongly suggest an attack pattern involving user interaction to navigate to these compromised resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 8

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://synerhu.ru/uplcv?utm_term=how+to+blur+text+in+pdf+free PDF link annotation
    • http://geoplan.su/userfiles/file/36537372050.pdfIn PDF document text
    • http://synphabase.ch/upload/file/tosaxazum.pdfIn PDF document text
    • http://randalljroutson.com/clients/44711/File/43627726269.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609db526e5dff---14840785022.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/romat.pdfIn PDF document text
    • http://msinziniering.com/userfiles/file/gitimopesebipisebu.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ca6278b7ba6---jovazotuponisisudakojusit.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/8cfe7bdfb69ac0c52b5c514f39b896ba/92506990242.pdfIn PDF document text
    • https://sunrise-photon.com/upfiles/editor/files/17143577677.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/18512019486.pdfIn PDF document text
    • http://szzxwx.com/Upload/Upload/file/2021724021228531.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1608cb4cd88aae---rikekeluninig.pdfIn PDF document text
    • https://chameleoncoupons.com/adgprocessing/uploads/files/bodefukugak.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/2a35953d1e63da892c42165416edc3eb/basigi.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160fd361061c01---31115782839.pdfIn PDF document text
    • http://yuha.be/_files/file/17832582024.pdfIn PDF document text
    • http://cissi.it/userfiles/files/rudubi.pdfIn PDF document text
    • http://mea-travel.pl/userfiles/file/28327857722.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/mitom.pdfIn PDF document text
    • http://cmtsport.com/pliki/89966939636.pdfIn PDF document text
    • http://wo-kop.pl/userfiles/file/4074245108.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b9d5663912c---noganexisimenokemuvukob.pdfIn PDF document text
    • http://technoculture.cz/admin/upload/file/pivutemabenofonot.pdfIn PDF document text
    • http://n-production.com/upload/fckeditor/file/daruma.pdfIn PDF document text
    • 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_off0000f584.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF584 18120 bytes
SHA-256: 3a8f772277fa21864b14b1a44c2743378ee9c2bed10c8581bdd6cda02ce1f0de
font_01_sfnt_off00012523.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12523 10580 bytes
SHA-256: 0b4aa35b5abdcc5eeb962cdf928f23316d475216aa3e4f4a0066c2772d09956a
font_02_sfnt_off00013d28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D28 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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