Malicious PDF — malware analysis report

Static analysis result for SHA-256 977764d8e0261f0e…

MALICIOUS

PDF

76.8 KB Created: 2021-09-03 11:29:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: dad9161fa75fa67b076140276e9b1286 SHA-1: 20d95b0a26e66ad660a6bd9eb775e03900e3eb62 SHA-256: 977764d8e0261f0e36aae909c8be73efc9da314acfe4536153dda306ab9ad660
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these external links. No scripts were extracted, but the structure and URL analysis are sufficient for a high-confidence assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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 https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/9161def72379c579312c0cff6568cc5f/36442604565.pdf In PDF document text
    • http://shinies.ru/img/lib/file/28770893280.pdfIn PDF document text
    • http://111-orte.de/testarea/cwsCMSlight/media/files/jadid.pdfIn PDF document text
    • https://rockdental.co.uk/wp-content/plugins/super-forms/uploads/php/files/3905a4514c6af7ce902e1533a0ba8f4f/50735864737.pdfIn PDF document text
    • http://cancercareresearch.com/userfiles/file/66045243067.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/53585569039.pdfIn PDF document text
    • http://15449010.com/FileData/ckfinder/files/20210820_2F242937929B8D47.pdfIn PDF document text
    • http://sibleyestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/9230195030.pdfIn PDF document text
    • https://bobecoingatlan.com/uploads/editor/file/wenifamepiribisisunow.pdfIn PDF document text
    • http://papierplus.pl/userfiles/file/taritopexemiluwenola.pdfIn PDF document text
    • http://jcbcharpentebois.com/ressource/site-image/files/13041454870.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1608f04a695d89---pixewalulikawiw.pdfIn PDF document text
    • https://ratco-hardware.com/Ups/files/15180061425.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a9a6c7b7495---17435919719.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/c3b7b3d3d5f66a5f3d876318c35b20ad/sefifobovo.pdfIn PDF document text
    • http://51www.org/uploadfile/file/2a38500b41ee2c0b6bf46f77e8a4f0fe.pdfIn PDF document text
    • https://tortugafilms.ca/adminfiles/file/97395693006.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607973b3066ab---91442384154.pdfIn PDF document text
    • http://russkiivopros.com/images/FCKeditor/file/vawir.pdfIn PDF document text
    • https://itexpertdog.com/upload/files/vodajo.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160dddda1011d9---44322308107.pdfIn PDF document text
    • http://519pf.com/userfiles/files/tavubuko.pdfIn PDF document text
    • http://tataservice.it/userfiles/file/7051011512.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b9ed2e9f1d6---15318770387.pdfIn PDF document text
    • https://www.highlandernepal.com/assets/ckfinder/userfiles/files/diwibiz.pdfIn PDF document text
    • http://sity-luxe.ru/userfiles/file/82720306778.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=prefix+and+suffix+meaning+worksheetsPDF 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_off0000c7f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7F6 17044 bytes
SHA-256: 00b052522fe3a3302f4425e1e72337dae5e7b5ec2bee221b1e0c95b9389f3f0b
font_01_sfnt_off0000f39b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF39B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010bb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BB2 11136 bytes
SHA-256: 763dd43cb86b0a7538181bfc61f5da493771f7ddb8451c2749f420ab7fbfb012