Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd80c951667f214a…

MALICIOUS

PDF

87.9 KB Created: 2021-09-08 00:23:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ffecc214559afabfd85246af24bc8c6b SHA-1: 5f8d2f2405804604596cd537d59abbe58e10ecff SHA-256: bd80c951667f214ab3e560a408428122339e64398f4dab42a4f4240485cfec91
164 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The sample contains a link farm pointing to compromised CMS upload storage, suggesting it's designed to host and distribute malicious files. The presence of a 'download button' heuristic further supports a phishing or social engineering lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • 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.
  • 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 http://akcjonariusz.com/UserFiles/file/72195442342.pdf In PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/8cec3c89c0f88401f4de93c4fd9c64a6/gudesiku.pdfIn PDF document text
    • http://chatfieldfarms101.com/userimages/vetupuxeteveposame.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/3eeb99c222c3b682f46fe927543b2ea8/vaneduxanakataxubomu.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/98437854525.pdfIn PDF document text
    • http://nagymester.com/userfiles/file/piwigititenadurawajafoji.pdfIn PDF document text
    • https://aquatrustfina.com/userfiles/file/naworebalugikabejefoni.pdfIn PDF document text
    • http://pestcontroluttara.com/ck/upload/files/24571086818.pdfIn PDF document text
    • http://suseefinance.com/userfiles/file/lororagemakorenababemit.pdfIn PDF document text
    • https://uleiuri.ro/userfiles/file/68236300524.pdfIn PDF document text
    • http://chukysovin.com/img-svc/files/mokuzimumorojulu.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/4d62712766830df6a56b26d50cf29d38/pofilexitiraruwanaduxonal.pdfIn PDF document text
    • https://west-holding.com/userfiles/file/fokiperotizokamepovudu.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/d591edc3a10f53cbeae21ff72b1dc8c7/dovukakuzusevasagavir.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093cdc7b71a2---fadujumewo.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/34493948242.pdfIn PDF document text
    • http://tms-operation.com/upload/files/wikoxuxilubozoj.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/vi7eva30evsl3h141qkr0801j2/78139760049.pdfIn PDF document text
    • https://etcbt.com/userfiles/file/1986514169.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160d9d060c5162---gasavadosiranekakaj.pdfIn PDF document text
    • http://jj-metals.com/userfiles/file/2021090714332473499.pdfIn PDF document text
    • http://ateliergermain.net/sites/default/files/file/37155795262.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160eff7197b756---gabutaxubujedakamodunof.pdfIn PDF document text
    • http://emotionpicturesfestival.gr/userfiles/file/porulipo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=daily+worksheet+template+excelPDF 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_off0000f08e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF08E 10928 bytes
SHA-256: d92aa44d7ff6af8e0b99f807f8fe396ea6c8d3507bf4d4df8bc277f0169855a4
font_01_sfnt_off00010a01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A01 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012213.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12213 18592 bytes
SHA-256: e679a9ace0e6329ceef9dcfc68d1b343cb3dde94ab4b6a8a36aa7c1a29b3df89