Malicious PDF — malware analysis report

Static analysis result for SHA-256 2887b9e382c3b77a…

MALICIOUS

PDF

75.1 KB Created: 2021-09-06 07:17:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d20c8d72c7d4eff6776b66d8cf3c2794 SHA-1: 593bccee3d6a77f8528bd160371922cb3e054878 SHA-256: 2887b9e382c3b77a322177f69d34d7acd212072449193c13a42b82279e129325
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous external URIs and link farms pointing to compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution scheme. The document body is heavily obfuscated and unreadable, but the presence of external links indicates an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9939

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://smidgel.ru/uplcv?utm_term=continuum+mechanics+for+engineers+mase+3rd+edition+pdf PDF link annotation
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/e67e9d17497ce6671eff7fc21f6d71f8/nudirapupu.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/94c8ab020642c2b1e4ac765d249f2fd9/viwofebilosulimu.pdfIn PDF document text
    • http://perseverance.cyou/updatefiles/file/vazumojiba.pdfIn PDF document text
    • http://vuoncotichdep.com/upload/files/64787348422.pdfIn PDF document text
    • https://humble-brag.com/wp-content/plugins/super-forms/uploads/php/files/d3rufji69au9hu6pdc8fmf3auf/5032944829.pdfIn PDF document text
    • https://sfeerweter.nl/userfiles/files/gilij.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad03757e896---97607661072.pdfIn PDF document text
    • http://podushka.by/files/files/19543626400.pdfIn PDF document text
    • http://cableesmaltado.com/d/files/71714992668.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1611a80f040459---27282921911.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c252cf46c61---wadasawakopafomo.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2394be30a5---7363933867.pdfIn PDF document text
    • https://yingzhaoliuart.com/upload/file/53842827396.pdfIn PDF document text
    • http://thepokeluau.com/uploads/files/gawazeker.pdfIn PDF document text
    • http://dental-forum.ru/userfiles/file/84307799697.pdfIn PDF document text
    • http://ergo-logo-bamberg.de/userfiles/file/61505057874.pdfIn PDF document text
    • http://namuvaldymas.lt/userfiles/file/tumugeligujusowamiwi.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/312aaba80f9b826ad0739d74047c369e/bujanozapokenefituwopetan.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be94b19515a---75254425026.pdfIn PDF document text
    • https://mebelihome.ru/upload_picture/dewelufaro.pdfIn PDF document text
    • http://www.reenactmentmarket.eu/images/wyswig_images/file/gosilageduwudemofuwu.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/runamevekebisef.pdfIn PDF document text
    • http://www.somdattabasu.com/fckimages/file/xawegozexe.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a9baf4b2912---32292175626.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/2b2a76b552e2d383d210cb26c0c410b5/magevilopawomukosidixo.pdfIn PDF document text
    • http://kutscher-customs.de/gfx/userfiles/files/fodizutaposiboreve.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_off0000c223.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC223 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000da3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA3A 11324 bytes
SHA-256: 4e6423b08ee6893745f53cfd1ffcb3eef948e290f0339dea8828a30e4912a03a
font_02_sfnt_off0000f485.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF485 16328 bytes
SHA-256: ae45b0a251d1b44c9f6f4f47d99d2b91a11b6e5291c01d2f91b4675b879ba277

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