Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac236e26e6bb30ab…

MALICIOUS

PDF

87.1 KB Created: 2021-06-25 15:27:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 495cb5fa54922a4d31a3dba3df6ced17 SHA-1: 85221b444dd03d583c3fe89306ba76823524a3f4 SHA-256: ac236e26e6bb30ab405b21ae403785d61951a18d022f5f31da2b9cfb8c5479a2
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as a link farm, with many URLs pointing to compromised CMS uploads. The ML classifier and ClamAV also identified it as malicious, specifically as a phishing trojan. The document's structure and embedded links suggest an attempt to redirect users to malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/c4a76c35e74267c9095f86d8d19272a8/1654349030.pdf In PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acd320b11d6---40817067440.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/l959ae5fnrtork1giiq5mdm239/zesoravanetufulefewilid.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080291cb3b8f---fegixileronetofimigugivi.pdfIn PDF document text
    • https://avvocatoboretti.it/file/73336161754.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c86b105d09d---nesifopeneferudilanajilim.pdfIn PDF document text
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/8240e6cba207b6c33bc847021da0204e/46778233403.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/8be50af1033895a84fd13e381a647cd9/riwenenulikowikufezave.pdfIn PDF document text
    • http://boxethai38.com/upload/file/kibolorinesejomixe.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160737ef995807---21239238759.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/16087c3ec6c272---pijidariluwoxoga.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/97d7623868bb7a40e68bebd1cdd84e97/jifijuje.pdfIn PDF document text
    • http://nandeestationery.com/userfiles/files/6276305765.pdfIn PDF document text
    • http://stallingreunion.com/clients/a/a3/a37dbb3dca22f8cb40f44de83fe48269/File/11516006400.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/308ca1600bac261281dbfbd9ab462387/51347783206.pdfIn PDF document text
    • https://bandai-k.com/userfiles/file/piwudoguvimitumulavasi.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b276c685f23---14155578501.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=which+wich+nutritionPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f5e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5E6 10000 bytes
SHA-256: 835ab48f43f9c00783d0a1c6533682c5febb0e6ce6a0b832d2b9325e4055f5a8
font_01_sfnt_off00010c08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C08 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001241a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1241A 17184 bytes
SHA-256: f3b05e134f4519fc0d02295a03231edeb6f6ee2be09fc4dbcffc1a95d55e507d

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